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John von Neumann
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{{short description|mathematician and physicist}}{{Good article}}{{Use mdy dates|date=March 2015}}{{Eastern name order|Neumann JÃ¡nos Lajos}}- the content below is remote from Wikipedia
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Early life and education
Family background
File:Neumann Janos Szamitogeptudomanyi Tarsasag, Budapest, 5. ker. Bathory U. 16. IMG 20171024 152410-1560x2080.jpg|thumb|Von Neumann's birthplace, at 16 BÃ¡thory Street, Budapest. Since 1968, it has housed the John von Neumann Computer SocietyJohn von Neumann Computer SocietyVon Neumann was born Neumann JÃ¡nos Lajos to a wealthy, acculturated and non-observant Jewish family (in Hungarian the family name comes first. His given names equate to John Louis in English).Von Neumann was born in Budapest, Kingdom of Hungary, which was then part of the Austro-Hungarian Empire.{{sfn|Doran|von_Neumann|Stone|Kadison|2004|p=1}}NEWS, Myhrvold, Nathan, March 21, 1999,weblink John von Neumann, Time (magazine), Time, {{sfn|Blair|1957|p=104}} He was the eldest of three brothers; his two younger siblings were MihÃ¡ly (English: Michael von Neumann; 1907â€“1989) and MiklÃ³s (Nicholas von Neumann, 1911â€“2011).{{sfn|Dyson|1998|p=xxi}} His father, Neumann Miksa (Max von Neumann, 1873â€“1928) was a banker, who held a doctorate in law. He had moved to Budapest from PÃ©cs at the end of the 1880s.{{sfn|Macrae|1992|pp=38â€“42}} Miksa's father and grandfather were both born in Ond (now part of the town of Szerencs), ZemplÃ©n County, northern Hungary. John's mother was Kann Margit (English: Margaret Kann);{{sfn|Macrae|1992|pp=37â€“38}} her parents were Jakab Kann and Katalin Meisels.{{sfn|Macrae|1992|p=39}} Three generations of the Kann family lived in spacious apartments above the Kann-Heller offices in Budapest; von Neumann's family occupied an 18-room apartment on the top floor.{{sfn|Macrae|1992|pp=44â€“45}}On February 20, 1913, Emperor Franz Joseph elevated John's father to the Hungarian nobility for his service to the Austro-Hungarian Empire. The Neumann family thus acquired the hereditary appellation Margittai, meaning "of Margitta" (today Marghita, Romania). The family had no connection with the town; the appellation was chosen in reference to Margaret, as was their chosen coat of arms depicting three marguerites. Neumann JÃ¡nos became margittai Neumann JÃ¡nos (John Neumann de Margitta), which he later changed to the German Johann von Neumann.{{sfn|Macrae|1992|pp=57â€“58}}Child prodigy
Von Neumann was a child prodigy. When he was 6 years old, he could divide two 8-digit numbers in his head{{sfn|Henderson|2007|p=30}}{{sfn|Schneider|Gersting|Brinkman|2015|p=28}} and could converse in Ancient Greek. When the 6-year-old von Neumann caught his mother staring aimlessly, he asked her, "What are you calculating?"{{sfn|Mitchell|2009|p=124}}Children did not begin formal schooling in Hungary until they were ten years of age; governesses taught von Neumann, his brothers and his cousins. Max believed that knowledge of languages in addition to Hungarian was essential, so the children were tutored in English, French, German and Italian.{{sfn|Macrae|1992|pp=46â€“47}} By the age of 8, von Neumann was familiar with differential and integral calculus,JOURNAL, Halmos, P. R., The Legend of von Neumann, The American Mathematical Monthly, 80, 4, 382â€“394, 2319080, 10.2307/2319080, 1973, but he was particularly interested in history. He read his way through Wilhelm Oncken's 46-volume Allgemeine Geschichte in Einzeldarstellungen.{{sfn|Blair|1957|p=90}} A copy was contained in a private library Max purchased. One of the rooms in the apartment was converted into a library and reading room, with bookshelves from ceiling to floor.{{sfn|Macrae|1992|p=52}}Von Neumann entered the Lutheran Fasori EvangÃ©likus GimnÃ¡zium in 1911. Eugene Wigner was a year ahead of von Neumann at the Lutheran School and soon became his friend.{{sfn|Macrae|1992|pp=70â€“71}} This was one of the best schools in Budapest and was part of a brilliant education system designed for the elite. Under the Hungarian system, children received all their education at the one gymnasium. The Hungarian school system produced a generation noted for intellectual achievement, which included Theodore von KÃ¡rmÃ¡n (born 1881), George de Hevesy (born 1885), Michael Polanyi (born 1891), LeÃ³ SzilÃ¡rd (born 1898), Dennis Gabor (born 1900), Wigner (born 1902), Edward Teller (born 1908), and Paul ErdÅ‘s (born 1913).{{sfn|Doran|von_Neumann|Stone|Kadison|2004|p=3}} Collectively, they were sometimes known as "The Martians".{{sfn|Macrae|1992|pp=32â€“33}}{| class="infobox"! colspan=3 style="text-align:center" | First few von Neumann ordinals| 0|| = Ã˜| 1 0 }}Ã˜}}| 2 0, 1 }} Ã˜, {{mset|Ã˜}} }}| 3 0, 1, 2 }} Ã˜, {{msetÃ˜, {{mset|Ã˜}}}} }}| 4 0, 1, 2, 3 }} Ã˜, {{msetÃ˜, {{msetÃ˜, {{msetÃ˜, {{mset|Ã˜}}}}}} }}Although Max insisted von Neumann attend school at the grade level appropriate to his age, he agreed to hire private tutors to give him advanced instruction in those areas in which he had displayed an aptitude. At the age of 15, he began to study advanced calculus under the renowned analyst GÃ¡bor SzegÅ‘.{{sfn|Macrae|1992|pp=70â€“71}} On their first meeting, SzegÅ‘ was so astounded with the boy's mathematical talent that he was brought to tears.{{sfn|Glimm|Impagliazzo|Singer|1990|p=5}} Some of von Neumann's instant solutions to the problems that SzegÅ‘ posed in calculus are sketched out on his father's stationery and are still on display at the von Neumann archive in Budapest.{{sfn|Macrae|1992|pp=70â€“71}} By the age of 19, von Neumann had published two major mathematical papers, the second of which gave the modern definition of ordinal numbers, which superseded Georg Cantor's definition.{{sfn|Nasar|2001|p=81}} At the conclusion of his education at the gymnasium, von Neumann sat for and won the EÃ¶tvÃ¶s Prize, a national prize for mathematics.{{sfn|Macrae|1992|p=84}}University studies
According to his friend Theodore von KÃ¡rmÃ¡n, von Neumann's father wanted John to follow him into industry and thereby invest his time in a more financially useful endeavor than mathematics. In fact, his father requested Theodore von KÃ¡rmÃ¡n to persuade his son not to take mathematics as his major.von KÃ¡rmÃ¡n, T., & Edson, L. (1967). The wind and beyond. Little, Brown & Company. Von Neumann and his father decided that the best career path was to become a chemical engineer. This was not something that von Neumann had much knowledge of, so it was arranged for him to take a two-year, non-degree course in chemistry at the University of Berlin, after which he sat for the entrance exam to the prestigious ETH Zurich,{{sfn|Macrae|1992|pp=85â€“87}} which he passed in September 1923.{{sfn|Macrae|1992|p=97}} At the same time, von Neumann also entered PÃ¡zmÃ¡ny PÃ©ter University in Budapest,WEB, Ed Regis (author), Regis, Ed, Johnny Jiggles the Planet,weblink The New York Times, November 8, 1992, February 4, 2008, as a Ph.D. candidate in mathematics. For his thesis, he chose to produce an axiomatization of Cantor's set theory.JOURNAL, von Neumann, J., Die Axiomatisierung der Mengenlehre, Mathematische Zeitschrift, 27, 1, 1928, 669â€“752, 0025-5874, 10.1007/BF01171122, German, {{sfn|Macrae|1992|pp=86â€“87}} He graduated as a chemical engineer from ETH Zurich in 1926 (although Wigner says that von Neumann was never very attached to the subject of chemistry),The Collected Works of Eugene Paul Wigner: Historical, Philosophical, and Socio-Political Papers. Historical and Biographical Reflections and Syntheses, By Eugene Paul Wigner, (Springer 2013), page 128 and passed his final examinations for his Ph.D. in mathematics simultaneously with his chemical engineering degree, of which Wigner wrote, "Evidently a Ph.D. thesis and examination did not constitute an appreciable effort." He then went to the University of GÃ¶ttingen on a grant from the Rockefeller Foundation to study mathematics under David Hilbert.{{sfn|Macrae|1992|pp=98â€“99}}Early career and private life
File:NeumannVonMargitta.jpg|thumb|upright=1.6|Excerpt from the university calendars for 1928 and 1928/29 of the Friedrich-Wilhelms-UniversitÃ¤t Berlin announcing Neumann's lectures on axiomatic set theory and mathematical logic, new work in quantum mechanics and special functions of mathematical physics.]]Von Neumann's habilitation was completed on December 13, 1927, and he started his lectures as a Privatdozent at the University of Berlin in 1928,JOURNAL, Hashagen, Ulf, Die Habilitation von John von Neumann an der Friedrich-Wilhelms-UniversitÃ¤t in Berlin: Urteile Ã¼ber einen ungarisch-jÃ¼dischen Mathematiker in Deutschland im Jahr 1927, Historia Mathematica, 37, 2, 242â€“280, 2010, harv, 10.1016/j.hm.2009.04.002, being the youngest person ever elected Privatdozent in the university's history in any subject.The History Of Game Theory, Volume 1: From the Beginnings to 1945, By Mary-Ann Dimand, Robert W Dimand, (Routledge, 2002), page 129 By the end of 1927, von Neumann had published twelve major papers in mathematics, and by the end of 1929, thirty-two papers, at a rate of nearly one major paper per month.{{sfn|Macrae|1992|p=145}} His reputed powers of memorization and recall allowed him to quickly memorize the pages of telephone directories, and recite the names, addresses and numbers therein.{{sfn|Blair|1957|p=90}} In 1929, he briefly became a Privatdozent at the University of Hamburg, where the prospects of becoming a tenured professor were better,{{sfn|Macrae|1992|pp=143â€“144}} but in October of that year a better offer presented itself when he was invited to Princeton University in Princeton, New Jersey.{{sfn|Macrae|1992|pp=155â€“157}}On New Year's Day in 1930, von Neumann married Marietta KÃ¶vesi, who had studied economics at Budapest University.{{sfn|Macrae|1992|pp=155â€“157}} Von Neumann and Marietta had one child, a daughter, Marina, born in 1935. As of 2017, she is a distinguished professor of business administration and public policy at the University of Michigan.WEB,weblink Marina Whitman, The Gerald R. Ford School of Public Policy at the University of Michigan, January 5, 2015, 2014-07-18, The couple divorced in 1937. In October 1938, von Neumann married Klara Dan, whom he had met during his last trips back to Budapest prior to the outbreak of World War II.{{sfn|Macrae|1992|pp=170â€“174}}Prior to his marriage to Marietta, von Neumann was baptized a Catholic in 1930.WEB, S., Bochner, John von Neumann; A Biographical Memoir,weblink National Academy of Sciences, 1958, August 16, 2015, Von Neumann's father, Max, had died in 1929. None of the family had converted to Christianity while Max was alive, but all did afterward.{{sfn|Macrae|1992|pp=43, 157}}In 1933, he was offered a lifetime professorship on the faculty of the Institute for Advanced Study in New Jersey when that institution's plan to appoint Hermann Weyl fell through.{{sfn|Macrae|1992|pp=167â€“168}} He remained a mathematics professor there until his death, although he had announced his intention to resign and become a professor at large at the University of California.{{sfn|Macrae|1992|p=371}} His mother, brothers and in-laws followed von Neumann to the United States in 1939.{{sfn|Macrae|1992|pp=195â€“196}} Von Neumann anglicized his first name to John, keeping the German-aristocratic surname of von Neumann. His brothers changed theirs to "Neumann" and "Vonneumann".{{sfn|Macrae|1992|pp=57â€“58}} Von Neumann became a naturalized citizen of the United States in 1937, and immediately tried to become a lieutenant in the United States Army's Officers Reserve Corps. He passed the exams easily, but was ultimately rejected because of his age.{{sfn|Macrae|1992|pp=190â€“195}} His prewar analysis of how France would stand up to Germany is often quoted: "Oh, France won't matter."{{sfn|Ulam|1983|p=70}}Klara and John von Neumann were socially active within the local academic community.{{sfn|Macrae|1992|pp=170â€“171}} His white clapboard house at 26 Westcott Road was one of the largest private residences in Princeton.{{sfn|Regis|1987|p=103}} He took great care of his clothing and would always wear formal suits. He once wore a three-piece pinstripe when he rode down the Grand Canyon astride a mule. Hilbert is reported to have asked "Pray, who is the candidate's tailor?" at von Neumann's 1926 doctoral exam, as he had never seen such beautiful evening clothes.NEWS,weblink Unleashing the Power, May 4, 2012, The New York Times, Poundstone, William, Von Neumann held a lifelong passion for ancient history, being renowned for his prodigious historical knowledge. A professor of Byzantine history at Princeton once said that von Neumann had greater expertise in Byzantine history than he did.Blair, pp. 89â€“104.Von Neumann liked to eat and drink; his wife, Klara, said that he could count everything except calories. He enjoyed Yiddish and "off-color" humor (especially limericks). He was a non-smoker.{{sfn|Macrae|1992|p=150}} In Princeton, he received complaints for regularly playing extremely loud German march music on his gramophone, which distracted those in neighboring offices, including Albert Einstein, from their work.{{sfn|Macrae|1992|p=48}} Von Neumann did some of his best work in noisy, chaotic environments, and once admonished his wife for preparing a quiet study for him to work in. He never used it, preferring the couple's living room with its television playing loudly.{{sfn|Blair|1957|p=94}} Despite being a notoriously bad driver, he nonetheless enjoyed drivingâ€”frequently while reading a bookâ€”occasioning numerous arrests as well as accidents. When Cuthbert Hurd hired him as a consultant to IBM, Hurd often quietly paid the fines for his traffic tickets.WEB, An Interview with Cuthbert C. Hurd, Stern, Nancy, Charles Babbage Institute, University of Minnesota, January 20, 1981,weblink June 3, 2010, Von Neumann's closest friend in the United States was mathematician StanisÅ‚aw Ulam. A later friend of Ulam's, Gian-Carlo Rota, wrote, "They would spend hours on end gossiping and giggling, swapping Jewish jokes, and drifting in and out of mathematical talk." When von Neumann was dying in the hospital, every time Ulam visited, he came prepared with a new collection of jokes to cheer him up.{{sfn|Rota|1989|pp=26â€“27}} He believed that much of his mathematical thought occurred intuitively, and he would often go to sleep with a problem unsolved and know the answer immediately upon waking up.{{sfn|Blair|1957|p=94}} Ulam noted that von Neumann's way of thinking might not be visual, but more aural.{{sfn|Macrae|1992|p=75}}Mathematics
Set theory
{{See also|Von Neumannâ€“Bernaysâ€“GÃ¶del set theory}}(File:NBG Evolution svg.svg|thumb|300px|History of approaches that led to NBG set theory)The axiomatization of mathematics, on the model of Euclid's Elements, had reached new levels of rigour and breadth at the end of the 19th century, particularly in arithmetic, thanks to the axiom schema of Richard Dedekind and Charles Sanders Peirce, and in geometry, thanks to Hilbert's axioms.{{sfn|Van Heijenoort|1967|pp=393â€“394}} But at the beginning of the 20th century, efforts to base mathematics on naive set theory suffered a setback due to Russell's paradox (on the set of all sets that do not belong to themselves).{{sfn|Macrae|1992|pp=104â€“105}} The problem of an adequate axiomatization of set theory was resolved implicitly about twenty years later by Ernst Zermelo and Abraham Fraenkel. Zermeloâ€“Fraenkel set theory provided a series of principles that allowed for the construction of the sets used in the everyday practice of mathematics, but they did not explicitly exclude the possibility of the existence of a set that belongs to itself. In his doctoral thesis of 1925, von Neumann demonstrated two techniques to exclude such setsâ€”the axiom of foundation and the notion of class.{{sfn|Van Heijenoort|1967|pp=393â€“394}}The axiom of foundation proposed that every set can be constructed from the bottom up in an ordered succession of steps by way of the principles of Zermelo and Fraenkel. If one set belongs to another then the first must necessarily come before the second in the succession. This excludes the possibility of a set belonging to itself. To demonstrate that the addition of this new axiom to the others did not produce contradictions, von Neumann introduced a method of demonstration, called the method of inner models, which later became an essential instrument in set theory.{{sfn|Van Heijenoort|1967|pp=393â€“394}}The second approach to the problem of sets belonging to themselves took as its base the notion of class, and defines a set as a class which belongs to other classes, while a proper class is defined as a class which does not belong to other classes. Under the Zermeloâ€“Fraenkel approach, the axioms impede the construction of a set of all sets which do not belong to themselves. In contrast, under the von Neumann approach, the class of all sets which do not belong to themselves can be constructed, but it is a proper class and not a set.{{sfn|Van Heijenoort|1967|pp=393â€“394}}With this contribution of von Neumann, the axiomatic system of the theory of sets avoided the contradictions of earlier systems, and became usable as a foundation for mathematics, despite the lack of a proof of its consistency. The next question was whether it provided definitive answers to all mathematical questions that could be posed in it, or whether it might be improved by adding stronger axioms that could be used to prove a broader class of theorems. A strongly negative answer to whether it was definitive arrived in September 1930 at the historic mathematical Congress of KÃ¶nigsberg, in which Kurt GÃ¶del announced his first theorem of incompleteness: the usual axiomatic systems are incomplete, in the sense that they cannot prove every truth which is expressible in their language. Moreover, every consistent extension of these systems would necessarily remain incomplete.{{sfn|von Neumann|2005|p=123}}Less than a month later, von Neumann, who had participated at the Congress, communicated to GÃ¶del an interesting consequence of his theorem: that the usual axiomatic systems are unable to demonstrate their own consistency.{{sfn|von Neumann|2005|p=123}} However, GÃ¶del had already discovered this consequence, now known as his second incompleteness theorem, and he sent von Neumann a preprint of his article containing both incompleteness theorems.{{sfn|Dawson|1997|p=70}} Von Neumann acknowledged GÃ¶del's priority in his next letter.{{sfn|von Neumann|2005|p=124}} He never thought much of "the American system of claiming personal priority for everything."{{sfn|Macrae|1992|p=182}}Von Neumann Paradox
Building on the work of Felix Hausdorff, in 1924 Stefan Banach and Alfred Tarski proved that given a solid ball in 3â€‘dimensional space, there exists a decomposition of the ball into a finite number of disjoint subsets, that can be reassembled together in a different way to yield two identical copies of the original ball. Banach and Tarski proved that, using isometric transformations, the result of taking apart and reassembling a two-dimensional figure would necessarily have the same area as the original. This would make creating two unit squares out of one impossible. However, in a 1929 paper,{{citation | first=J. | last=von Neumann | authorlink=John von Neumann | url=http://matwbn.icm.edu.pl/ksiazki/fm/fm13/fm1316.pdf | title=Zur allgemeinen Theorie des Masses | journal=Fundamenta Mathematicae | volume=13 | pages=73â€“116 | year=1929 | doi=10.4064/fm-13-1-73-116 }} von Neumann proved that paradoxical decompositions could use a group of transformations that include as a subgroup a free group with two generators. The group of area-preserving transformations contains such subgroups, and this opens the possibility of performing paradoxical decompositions using these subgroups. The class of groups isolated by von Neumann in his work on Banachâ€“Tarski decompositions subsequently was very important for many areas of mathematics, including von Neumann's own later work in measure theory (see below).Ergodic theory
In a series of famous papers that were published in 1932, von Neumann made foundational contributions to ergodic theory, a branch of mathematics that involves the states of dynamical systems with an invariant measure.Two famous papers are: JOURNAL, John, von Neumann, Proof of the Quasi-ergodic Hypothesis, 1932, Proc Natl Acad Sci USA, 18, 70â€“82, 10.1073/pnas.18.1.70, 16577432, 1, 1076162, 1932PNAS...18...70N, .JOURNAL, John, von Neumann, Physical Applications of the Ergodic Hypothesis, 1932, Proc Natl Acad Sci USA, 18, 263â€“266, 10.1073/pnas.18.3.263, 16587674, 3, 1076204, 86260, 1932PNAS...18..263N, .JOURNAL, Eberhard_Hopf, Eberhard, Hopf, Statistik der geodÃ¤tischen Linien in Mannigfaltigkeiten negativer KrÃ¼mmung, 1939, Leipzig Ber. Verhandl. SÃ¤chs. Akad. Wiss., 91, 261â€“304, Of the 1932 papers on ergodic theory, Paul Halmos writes that even "if von Neumann had never done anything else, they would have been sufficient to guarantee him mathematical immortality". By then von Neumann had already written his famous articles on operator theory, and the application of this work was instrumental in the von Neumann mean ergodic theorem.Operator theory
{{See also|Direct integral}}Von Neumann introduced the study of rings of operators, through the von Neumann algebras. A von Neumann algebra is a *-algebra of bounded operators on a Hilbert space that is closed in the weak operator topology and contains the identity operator.{{sfn|Petz|Redi|1995|pp=163â€“181}} The von Neumann bicommutant theorem shows that the analytic definition is equivalent to a purely algebraic definition as being equal to the bicommutant.WEB,weblink Von Neumann Algebras, January 6, 2016, Princeton University, Von Neumann embarked in 1936, with the partial collaboration of F.J. Murray, on the general study of factors classification of von Neumann algebras. The six major papers in which he developed that theory between 1936 and 1940 "rank among the masterpieces of analysis in the twentieth century".{{sfn|DieudonnÃ© |2008|p=90}} The direct integral was later introduced in 1949 by John von Neumann.WEB,weblinkweblink" title="web.archive.org/web/20150702001911weblink">weblink 2015-07-02, Direct Integrals of Hilbert Spaces and von Neumann Algebras, January 6, 2016, University of California at Los Angeles,Measure theory
{{See also|Lifting theory}}In measure theory, the "problem of measure" for an {{mvar|n}}-dimensional Euclidean space {{math|Rn}} may be stated as: "does there exist a positive, normalized, invariant, and additive set function on the class of all subsets of {{math|Rn}}?" The work of Felix Hausdorff and Stefan Banach had implied that the problem of measure has a positive solution if {{math|1=n = 1}} or {{math|1=n = 2}} and a negative solution (because of the Banachâ€“Tarski paradox) in all other cases. Von Neumann's work argued that the "problem is essentially group-theoretic in character": the existence of a measure could be determined by looking at the properties of the transformation group of the given space. The positive solution for spaces of dimension at most two, and the negative solution for higher dimensions, comes from the fact that the Euclidean group is a solvable group for dimension at most two, and is not solvable for higher dimensions. "Thus, according to von Neumann, it is the change of group that makes a difference, not the change of space."JOURNAL, Von Neumann on measure and ergodic theory, Paul Halmos, Halmos, Paul R., Bulletin of the American Mathematical Society, Bull. Amer. Math. Soc., 64, 3, Part 2, 1958, 86â€“94,weblink 10.1090/S0002-9904-1958-10203-7, In a number of von Neumann's papers, the methods of argument he employed are considered even more significant than the results. In anticipation of his later study of dimension theory in algebras of operators, von Neumann used results on equivalence by finite decomposition, and reformulated the problem of measure in terms of functions.JOURNAL, LÃ©on Van Hove, Van Hove, LÃ©on, Von Neumann's Contributions to Quantum Theory, Bulletin of the American Mathematical Society, 1958, 64, 3,weblink 95â€“99, 10.1090/s0002-9904-1958-10206-2, In his 1936 paper on analytic measure theory, he used the Haar theorem in the solution of Hilbert's fifth problem in the case of compact groups.JOURNAL, J., von Neumann, Die Einfuhrung Analytischer Parameter in Topologischen Gruppen, Annals of Mathematics, 34, 1, 2, 1933, 170â€“179, 10.2307/1968347, 1968347, In 1938, he was awarded the BÃ´cher Memorial Prize for his work in analysis.WEB,weblink AMS BÃ´cher Prize, AMS, January 5, 2016, 2018-01-12,Geometry
Von Neumann founded the field of continuous geometry.*{{Citation | last1=Neumann | first1=John von| author1-link=John von Neumann | title=Examples of continuous geometries | jstor=86391 | doi=10.1073/pnas.22.2.101 | jfm=62.0648.03 | year=1936b | journal=Proc. Natl. Acad. Sci. USA | volume=22 | issue=2 | pages=101â€“108 | pmid=16588050 | pmc=1076713| bibcode=1936PNAS...22..101N }}- {{Citation | last1=Neumann | first1=John von| author1-link=John von Neumann | title=Continuous geometry | origyear=1960 | url=https://books.google.com/books?id=onE5HncE-HgC | publisher=Princeton University Press | series=Princeton Landmarks in Mathematics | isbn=978-0-691-05893-1 | mr=0120174 | year=1998}}
- {{Citation | last1=Neumann | first1=John von| author1-link=John von Neumann | editor1-last=Taub | editor1-first=A. H. | title=Collected works. Vol. IV: Continuous geometry and other topics | url=https://books.google.com/books?id=HOTXAAAAMAAJ | publisher=Pergamon Press | location=Oxford | mr=0157874 | year=1962}}
- {{Citation | last1=Neumann | first1=John von| author1-link=John von Neumann | editor1-last=Halperin | editor1-first=Israel | title=Continuous geometries with a transition probability | origyear=1937 | url=https://books.google.com/books?id=ZPkVGr8NXugC | mr=634656 | year=1981 | journal=Memoirs of the American Mathematical Society | issn=0065-9266 | volume=34 | issue=252 | isbn=978-0-8218-2252-4 | doi=10.1090/memo/0252}} It followed his path-breaking work on rings of operators. In mathematics, continuous geometry is a substitute of complex projective geometry, where instead of the dimension of a subspace being in a discrete set 0, 1, ..., n, it can be an element of the unit interval [0,1]. Earlier, Menger and Birkhoff had axiomatized complex projective geometry in terms of the properties of its lattice of linear subspaces. Von Neumann, following his work on rings of operators, weakened those axioms to describe a broader class of lattices, the continuous geometries.
Lattice theory
Between 1937 and 1939, von Neumann worked on lattice theory, the theory of partially ordered sets in which every two elements have a greatest lower bound and a least upper bound. Garrett Birkhoff writes: "John von Neumann's brilliant mind blazed over lattice theory like a meteor".BOOK,weblink Birkhoff, Garrett, Garrett Birkhoff, Von Neumann and lattice theory, Bulletin of the American Mathematical Society, 64, 3, 978-0-8218-1025-5, 1958, 50â€“56, 10.1090/S0002-9904-1958-10192-5, Von Neumann provided an abstract exploration of dimension in completed complemented modular topological lattices (properties that arise in the lattices of subspaces of inner product spaces): "Dimension is determined, up to a positive linear transformation, by the following two properties. It is conserved by perspective mappings ("perspectivities") and ordered by inclusion. The deepest part of the proof concerns the equivalence of perspectivity with "projectivity by decomposition"â€”of which a corollary is the transitivity of perspectivity."Additionally, "[I]n the general case, von Neumann proved the following basic representation theorem. Any complemented modular lattice {{mvar|L}} having a "basis" of {{math|n â‰¥ 4}} pairwise perspective elements, is isomorphic with the lattice {{math|â„›(R)}} of all principal right-ideals of a suitable regular ring {{mvar|R}}. This conclusion is the culmination of 140 pages of brilliant and incisive algebra involving entirely novel axioms. Anyone wishing to get an unforgettable impression of the razor edge of von Neumann's mind, need merely try to pursue this chain of exact reasoning for himselfâ€”realizing that often five pages of it were written down before breakfast, seated at a living room writing-table in a bathrobe."Mathematical formulation of quantum mechanics
{{See also|von Neumann entropy|Quantum mutual information|Measurement in quantum mechanics#von Neumann measurement scheme|label 4 = von Neumann measurement scheme|Wave function collapse}}{{Quantum mechanics}}Von Neumann was the first to establish a rigorous mathematical framework for quantum mechanics, known as the Diracâ€“von Neumann axioms, with his 1932 work Mathematical Foundations of Quantum Mechanics. After having completed the axiomatization of set theory, he began to confront the axiomatization of quantum mechanics. He realized, in 1926, that a state of a quantum system could be represented by a point in a (complex) Hilbert space that, in general, could be infinite-dimensional even for a single particle. In this formalism of quantum mechanics, observable quantities such as position or momentum are represented as linear operators acting on the Hilbert space associated with the quantum system.{{sfn|Macrae|1992|pp=139â€“141}}The physics of quantum mechanics was thereby reduced to the mathematics of Hilbert spaces and linear operators acting on them. For example, the uncertainty principle, according to which the determination of the position of a particle prevents the determination of its momentum and vice versa, is translated into the non-commutativity of the two corresponding operators. This new mathematical formulation included as special cases the formulations of both Heisenberg and SchrÃ¶dinger.{{sfn|Macrae|1992|pp=139â€“141}} When Heisenberg was informed von Neumann had clarified the difference between an unbounded operator that was a self-adjoint operator and one that was merely symmetric, Heisenberg replied "Eh? What is the difference?"{{sfn|Macrae|1992|p=142}}Von Neumann's abstract treatment permitted him also to confront the foundational issue of determinism versus non-determinism, and in the book he presented a proof that the statistical results of quantum mechanics could not possibly be averages of an underlying set of determined "hidden variables," as in classical statistical mechanics. In 1935, Grete Hermann published a paper arguing that the proof contained a conceptual error and was therefore invalid.JOURNAL, Grete, Hermann, Grete Hermann, Die naturphilosophischen Grundlagen der Quantenmechanik, Naturwissenschaften, 23, 42, 718–721, 1935, 10.1007/BF01491142, 1935NW.....23..718H, English translation in BOOK, Hermann, Grete, Grete Hermann — Between physics and philosophy, Elise, Crull, Guido, Bacciagaluppi, Springer, 2016, 239–278, Hermann's work was largely ignored until after John S. Bell made essentially the same argument in 1966.JOURNAL, John S., Bell, John S. Bell, On the problem of hidden variables in quantum mechanics, Reviews of Modern Physics, 38, 3, 447–452, 10.1103/RevModPhys.38.447, 1966RvMP...38..447B, 1966, However, in 2010, Jeffrey Bub argued that Bell had misconstrued von Neumann's proof, and pointed out that the proof, though not valid for all hidden variable theories, does rule out a well-defined and important subset. Bub also suggests that von Neumann was aware of this limitation, and that von Neumann did not claim that his proof completely ruled out hidden variable theories.JOURNAL, Von Neumann's 'No Hidden Variables' Proof: A Re-Appraisal, 2010, Bub, Jeffrey, Foundations of Physics, 40, 9â€“10, 1333â€“1340, 2010FoPh...40.1333B, 10.1007/s10701-010-9480-9, 1006.0499, The validity of Bub's argument is, in turn, disputed.JOURNAL, Homer nodded: von Neumann's surprising oversight, Foundations of Physics, 48, 9, 1007â€“1020, 2018, 1805.10311, Mermin, N. David, Schack, RÃ¼diger, N. David Mermin, 10.1007/s10701-018-0197-5, 2018FoPh...48.1007M, In any case, Gleason's Theorem of 1957 fills the gaps in von Neumann's approach.Von Neumann's proof inaugurated a line of research that ultimately led, through the work of Bell in 1964 on Bell's theorem, and the experiments of Alain Aspect in 1982, to the demonstration that quantum physics either requires a notion of reality substantially different from that of classical physics, or must include nonlocality in apparent violation of special relativity.JOURNAL, Studies in History and Philosophy of Modern Physics, 37, 4, 2006, 577â€“616, Philosophy enters the optics laboratory: Bell's theorem and its first experimental tests (1965â€“1982), Olival Jr., Freire, 10.1016/j.shpsb.2005.12.003, 2006SHPMP..37..577F, physics/0508180, In a chapter of The Mathematical Foundations of Quantum Mechanics, von Neumann deeply analyzed the so-called measurement problem. He concluded that the entire physical universe could be made subject to the universal wave function. Since something "outside the calculation" was needed to collapse the wave function, von Neumann concluded that the collapse was caused by the consciousness of the experimenter. Von Neumann argued that the mathematics of quantum mechanics allows the collapse of the wave function to be placed at any position in the causal chain from the measurement device to the "subjective consciousness" of the human observer. Although this view was accepted by Eugene Wigner,JOURNAL, 10.1119/1.1973829, 35, 12, 1169â€“1170, Wigner, Eugene, Henry Margenau, Remarks on the Mind Body Question, in Symmetries and Reflections, Scientific Essays, American Journal of Physics, December 1967, 1967AmJPh..35.1169W, the Von Neumannâ€“Wigner interpretation never gained acceptance amongst the majority of physicists).JOURNAL, M., Schlosshauer, J., Koer, A., Zeilinger, A Snapshot of Foundational Attitudes Toward Quantum Mechanics, 2013, 222â€“230, 44, 3, Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics, 1301.1069, 10.1016/j.shpsb.2013.04.004, 2013SHPMP..44..222S, The Von Neumannâ€“Wigner interpretation has been summarized as follows:The rules of quantum mechanics are correct but there is only one system which may be treated with quantum mechanics, namely the entire material world. There exist external observers which cannot be treated within quantum mechanics, namely human (and perhaps animal) minds, which perform measurements on the brain causing wave function collapse.Schreiber, Z. The Nine Lives of SchrÃ¶dingers's Cat.Though theories of quantum mechanics continue to evolve to this day, there is a basic framework for the mathematical formalism of problems in quantum mechanics which underlies the majority of approaches and can be traced back to the mathematical formalisms and techniques first used by von Neumann. In other words, discussions about interpretation of the theory, and extensions to it, are now mostly conducted on the basis of shared assumptions about the mathematical foundations.Von Neumann Entropy
Von Neumann entropy is extensively used in different forms (conditional entropies, relative entropies, etc.) in the framework of quantum information theory.BOOK, Nielsen, Michael A. and Isaac Chuang, Quantum computation and quantum information, 2001, Cambridge Univ. Press, Cambridge [u.a.], 978-0-521-63503-5, 700, Repr., Entanglement measures are based upon some quantity directly related to the von Neumann entropy. Given a statistical ensemble of quantum mechanical systems with the density matrix rho, it is given by S(rho) = -operatorname{Tr}(rho ln rho). , Many of the same entropy measures in classical information theory can also be generalized to the quantum case, such as Holevo entropy and the conditional quantum entropy.Quantum mutual information
Quantum information theory is largely concerned with the interpretation and uses of von Neumann entropy. The von Neumann entropy is the cornerstone in the development of quantum information theory, while the Shannon entropy applies to classical information theory. This is considered a historical anomaly, as it might have been expected that Shannon entropy was discovered prior to Von Neumann entropy, given the latter's more widespread application to quantum information theory. However, the historical reverse occurred. Von Neumann first discovered von Neumann entropy, and applied it to questions of statistical physics. Decades later, Shannon developed an information-theoretic formula for use in classical information theory, and asked von Neumann what to call it, with von Neumman telling him to call it Shannon entropy, as it was a special case of von Neumann entropy.Quantum Information Theory, By Mark M. Wilde, (Cambridge University Press 2013), page 252Density matrix
The formalism of density operators and matrices was introduced by von Neumann{{Citation | last = von Neumann | first = John | year = 1927 | authorlink = John von Neumann |title=Wahrscheinlichkeitstheoretischer Aufbau der Quantenmechanik | journal = GÃ¶ttinger Nachrichten | volume = 1|pages= 245â€“272|url=https://eudml.org/doc/59230}} in 1927 and independently, but less systematically by Lev Landau{{Citation| title=Density functional theory | author=SchlÃ¼ter, Michael and Lu Jeu Sham | journal=Physics Today | year=1982 | volume=35 | pages=36â€“43 | doi=10.1063/1.2914933 | issue=2 | bibcode=1982PhT....35b..36S }} and Felix Bloch{{Citation | title=Density matrices as polarization vectors | author=Ugo Fano | journal=Rendiconti Lincei |date=June 1995 | volume=6 | issue=2 | pages=123â€“130 | doi=10.1007/BF03001661}} in 1927 and 1946 respectively. The density matrix is an alternative way in which to represent the state of a quantum system, which could otherwise be represented using the wavefunction. The density matrix allows the solution of certain time-dependent problems in quantum mechanics.Von Neumann measurement scheme
The von Neumann measurement scheme, the ancestor of quantum decoherence theory, represents measurements projectively by taking into account the measuring apparatus which is also treated as a quantum object. The 'projective measurement' scheme introduced by von Neumann, led to the development of quantum decoherence theories.Dualism, Platonism and Voluntarism: Explorations at the Quantum, Microscopic, Mesoscopic and Symbolic Neural Levels, (Cambridge Scholars 2016), page 215Quantum logic
Von Neumann first proposed a quantum logic in his 1932 treatise Mathematical Foundations of Quantum Mechanics, where he noted that projections on a Hilbert space can be viewed as propositions about physical observables. The field of quantum logic was subsequently inaugurated, in a famous paper of 1936 by von Neumann and Garrett Birkhoff, the first work ever to introduce quantum logics,BOOK, Gabbay, Dov M., Dov Gabbay, Woods, John, The Many Valued and Nonmonotonic Turn in Logic,weblink 2007, Elsevier, 978-0-08-054939-2, 205â€“2017, The History of Quantum Logic, wherein von Neumann and Birkhoff first proved that quantum mechanics requires a propositional calculus substantially different from all classical logics and rigorously isolated a new algebraic structure for quantum logics. The concept of creating a propositional calculus for quantum logic was first outlined in a short section in von Neumann's 1932 work, but in 1936, the need for the new propositional calculus was demonstrated through several proofs. For example, photons cannot pass through two successive filters that are polarized perpendicularly (e.g., one horizontally and the other vertically), and therefore, a fortiori, it cannot pass if a third filter polarized diagonally is added to the other two, either before or after them in the succession, but if the third filter is added in between the other two, the photons will, indeed, pass through. This experimental fact is translatable into logic as the non-commutativity of conjunction (Aland B)ne (Bland A). It was also demonstrated that the laws of distribution of classical logic, Plor(Qland R)=(Plor Q)land(Plor R) and Pland (Qlor R)=(Pland Q)lor(Pland R), are not valid for quantum theory.The reason for this is that a quantum disjunction, unlike the case for classical disjunction, can be true even when both of the disjuncts are false and this is, in turn, attributable to the fact that it is frequently the case, in quantum mechanics, that a pair of alternatives are semantically determinate, while each of its members are necessarily indeterminate. This latter property can be illustrated by a simple example. Suppose we are dealing with particles (such as electrons) of semi-integral spin (spin angular momentum) for which there are only two possible values: positive or negative. Then, a principle of indetermination establishes that the spin, relative to two different directions (e.g., x and y) results in a pair of incompatible quantities. Suppose that the state É¸ of a certain electron verifies the proposition "the spin of the electron in the x direction is positive." By the principle of indeterminacy, the value of the spin in the direction y will be completely indeterminate for É¸. Hence, É¸ can verify neither the proposition "the spin in the direction of y is positive" northe proposition "the spin in the direction of y is negative." Nevertheless, the disjunction of the propositions "the spin in the direction of y is positive or the spin in the direction of y is negative" must be true for É¸.In the case of distribution, it is therefore possible to have a situation in which A land (Blor C)= Aland 1 = A, while (Aland B)lor (Aland C)=0lor 0=0.JOURNAL, The Logic of Quantum Mechanics, Garrett, Birkhoff, Garrett Birkhoff, John, von Neumann, Annals of Mathematics, 37, 4, October 1936, 823â€“843, 10.2307/1968621, 1968621, As Hilary Putnam writes, von Neumann replaced classical logic with a logic constructed in orthomodular lattices (isomorphic to the lattice of subspaces of the Hilbert space of a given physical system).BOOK, Putnam, Hilary, Hilary Putnam, Philosophical Papers: Volume 3, Realism and Reason,weblink 1985, Cambridge University Press, 978-0-521-31394-0, 263,Game theory
Von Neumann founded the field of game theory as a mathematical discipline.JOURNAL, Kuhn, H. W., Harold W. Kuhn, Tucker, A. W., Albert W. Tucker, John von Neumann's work in the theory of games and mathematical economics, Bull. Amer. Math. Soc., 1958, 64 (Part 2), 3, 100â€“122, 0096572, 10.1090/s0002-9904-1958-10209-8, 10.1.1.320.2987, Von Neumann proved his minimax theorem in 1928. This theorem establishes that in zero-sum games with perfect information (i.e. in which players know at each time all moves that have taken place so far), there exists a pair of strategies for both players that allows each to minimize his maximum losses, hence the name minimax. When examining every possible strategy, a player must consider all the possible responses of his adversary. The player then plays out the strategy that will result in the minimization of his maximum loss.JOURNAL, von Neumann, J:, Zur Theorie der Gesellschaftsspiele, German, Mathematische Annalen, 100, 1928, 295â€“320, 10.1007/bf01448847, 1928, 1928MatAn.100...32C, Such strategies, which minimize the maximum loss for each player, are called optimal. Von Neumann showed that their minimaxes are equal (in absolute value) and contrary (in sign). Von Neumann improved and extended the minimax theorem to include games involving imperfect information and games with more than two players, publishing this result in his 1944 Theory of Games and Economic Behavior (written with Oskar Morgenstern). Morgenstern wrote a paper on game theory and thought he would show it to von Neumann because of his interest in the subject. He read it and said to Morgenstern that he should put more in it. This was repeated a couple of times, and then von Neumann became a coauthor and the paper became 100 pages long. Then it became a book. The public interest in this work was such that The New York Times ran a front-page story.{{citation needed|date=March 2018}} In this book, von Neumann declared that economic theory needed to use functional analytic methods, especially convex sets and topological fixed-point theorem, rather than the traditional differential calculus, because the maximum-operator did not preserve differentiable functions.Independently, Leonid Kantorovich's functional analytic work on mathematical economics also focused attention on optimization theory, non-differentiability, and vector lattices. Von Neumann's functional-analytic techniquesâ€”the use of duality pairings of real vector spaces to represent prices and quantities, the use of supporting and separating hyperplanes and convex sets, and fixed-point theoryâ€”have been the primary tools of mathematical economics ever since.{{sfn|Blume|2008}}Mathematical economics
Von Neumann raised the intellectual and mathematical level of economics in several influential publications. For his model of an expanding economy, von Neumann proved the existence and uniqueness of an equilibrium using his generalization of the Brouwer fixed-point theorem. Von Neumann's model of an expanding economy considered the matrix pencil A âˆ’ Î»B with nonnegative matrices A and B; von Neumann sought probability vectors p and q and a positive number Î» that would solve the complementarity equation
p^T (A - lambda B) q = 0
along with two inequality systems expressing economic efficiency. In this model, the (transposed) probability vector p represents the prices of the goods while the probability vector q represents the "intensity" at which the production process would run. The unique solution Î» represents the growth factor which is 1 plus the rate of growth of the economy; the rate of growth equals the interest rate.For this problem to have a unique solution, it suffices that the nonnegative matrices A and B satisfy an irreducibility condition, generalizing that of the Perronâ€“Frobenius theorem of nonnegative matrices, which considers the (simplified) eigenvalue problem
A âˆ’ Î» I q = 0,
where the nonnegative matrix A must be square and where the diagonal matrix I is the identity matrix. Von Neumann's irreducibility condition was called the "whales and wranglers" hypothesis by David Champernowne, who provided a verbal and economic commentary on the English translation of von Neumann's article. Von Neumann's hypothesis implied that every economic process used a positive amount of every economic good. Weaker "irreducibility" conditions were given by David Gale and by John Kemeny, Oskar Morgenstern, and Gerald L. Thompson in the 1950s and then by Stephen M. Robinson in the 1970s.{{sfn|Morgenstern|Thompson|1976||pages=xviii, 277}}Von Neumann's results have been viewed as a special case of linear programming, where von Neumann's model uses only nonnegative matrices. The study of von Neumann's model of an expanding economy continues to interest mathematical economists with interests in computational economics.{{sfn|Rockafellar|1970|pp=i, 74}}{{sfn|Rockafellar|1974|pp=351â€“378}}{{sfn|Ye|1997|pp=277â€“299}} This paper has been called the greatest paper in mathematical economics by several authors, who recognized its introduction of fixed-point theorems, linear inequalities, complementary slackness, and saddlepoint duality. In the proceedings of a conference on von Neumann's growth model, Paul Samuelson said that many mathematicians had developed methods useful to economists, but that von Neumann was unique in having made significant contributions to economic theory itself.BOOK, Bruckmann, Gerhart, Weber, Wilhelm, September 21, 1971, 10.1007/978-3-662-24667-2, Contributions to von Neumann's Growth Model, Proceedings of a Conference Organized by the Institute for Advanced Studies Vienna, Austria, July 6 and 7, 1970, Springerâ€“Verlag, 978-3-662-22738-1, Von Neumann's famous 9-page paper started life as a talk at Princeton and then became a paper in German, which was eventually translated into English. His interest in economics that led to that paper began as follows: When lecturing at Berlin in 1928 and 1929 he spent his summers back home in Budapest, and so did the economist Nicholas Kaldor, and they hit it off. Kaldor recommended that von Neumann read a book by the mathematical economist LÃ©on Walras. Von Neumann found some faults in that book and corrected them, for example, replacing equations by inequalities. He noticed that Walras's General Equilibrium Theory and Walras' Law, which led to systems of simultaneous linear equations, could produce the absurd result that the profit could be maximized by producing and selling a negative quantity of a product. He replaced the equations by inequalities, introduced dynamic equilibria, among other things, and eventually produced the paper.{{sfn|Macrae|1992|pp=250â€“253}}Linear programming
Building on his results on matrix games and on his model of an expanding economy, von Neumann invented the theory of duality in linear programming, after George Dantzig described his work in a few minutes, when an impatient von Neumann asked him to get to the point. Then, Dantzig listened dumbfounded while von Neumann provided an hour lecture on convex sets, fixed-point theory, and duality, conjecturing the equivalence between matrix games and linear programming.BOOK, Dantzig, George, Thapa, Mukund N., Linear Programming : 2: Theory and Extensions, Springer Science+Business Media, Springer-Verlag, New York, NY, 2003, 978-1-4419-3140-5, Later, von Neumann suggested a new method of linear programming, using the homogeneous linear system of Gordan (1873), which was later popularized by Karmarkar's algorithm. Von Neumann's method used a pivoting algorithm between simplices, with the pivoting decision determined by a nonnegative least squares subproblem with a convexity constraint (projecting the zero-vector onto the convex hull of the active simplex). Von Neumann's algorithm was the first interior point method of linear programming.Mathematical statistics
Von Neumann made fundamental contributions to mathematical statistics. In 1941, he derived the exact distribution of the ratio of the mean square of successive differences to the sample variance for independent and identically normally distributed variables.JOURNAL, von Neumann, John, 1941, Distribution of the ratio of the mean square successive difference to the variance, Annals of Mathematical Statistics, 12, 367â€“395, 2235951, 10.1214/aoms/1177731677, 4, mdy-all, This ratio was applied to the residuals from regression models and is commonly known as the Durbinâ€“Watson statisticJOURNAL, Durbin, J., Watson, G. S., 1950, Testing for Serial Correlation in Least Squares Regression, I, Biometrika, 37, 409â€“428, 14801065, 3â€“4, 10.2307/2332391, 2332391, for testing the null hypothesis that the errors are serially independent against the alternative that they follow a stationary first order autoregression.Subsequently, Denis Sargan and Alok Bhargava extended the results for testing if the errors on a regression model follow a Gaussian random walk (i.e., possess a unit root) against the alternative that they are a stationary first order autoregression.JOURNAL, Sargan, J.D., Bhargava, Alok, 1983, 1912252, Testing residuals from least squares regression for being generated by the Gaussian random walk, Econometrica, 51, 1, 153â€“174, 10.2307/1912252,Fluid dynamics
Von Neumann made fundamental contributions in the field of fluid dynamics.Von Neumann's contributions to fluid dynamics included his discovery of the classic flow solution to blast waves,{{sfn|von Neumann|1963a|pp=219â€“237}} and the co-discovery (independently of Yakov Borisovich Zel'dovich and Werner DÃ¶ring) of the ZND detonation model of explosives.{{sfn|von Neumann|1963b|pp=205â€“218}} During the 1930s, von Neumann became an authority on the mathematics of shaped charges.Ballistics: Theory and Design of Guns and Ammunition, Second EditionBy Donald E. Carlucci, Sidney S. Jacobson, (CRC Press, 26 Aug 2013), page 523Later with Robert D. Richtmyer, von Neumann developed an algorithm defining artificial viscosity that improved the understanding of shock waves. When computers solved hydrodynamic or aerodynamic problems, they tried to put too many computational grid points at regions of sharp discontinuity (shock waves). The mathematics of artificial viscosity smoothed the shock transition without sacrificing basic physics.JOURNAL, A Method for the Numerical Calculation of Hydrodynamic Shocks, von Neumann, J., Richtmyer, R. D., Robert D. Richtmyer, Journal of Applied Physics, 21, 3, 232â€“237, March 1950, 10.1063/1.1699639, 1950JAP....21..232V, Von Neumann soon applied computer modelling to the field, developing software for his ballistics research. During WW2, he arrived one day at the office of R.H. Kent, the Director of the US Army's Ballistic Research Laboratory, with a computer program he had created for calculating a one-dimensional model of 100 molecules to simulate a shock wave. Von Neumann then gave a seminar on his computer program to an audience which included his friend Theodore von KÃ¡rmÃ¡n. After von Neumann had finished, von KÃ¡rmÃ¡n said "Well, Johnny, that's very interesting. Of course you realize Lagrange also used digital models to simulate continuum mechanics." It was evident from von Neumann's face, that he had been unaware of Lagrange's MÃ©canique analytique.BOOK, A History of Computing in the Twentieth Century, Nicholas, Metropolis, Elsevier, 2014, 24, 978-1-4832-9668-5,Mastery of mathematics
Stan Ulam, who knew von Neumann well, described his mastery of mathematics this way: "Most mathematicians know one method. For example, Norbert Wiener had mastered Fourier transforms. Some mathematicians have mastered two methods and might really impress someone who knows only one of them. John von Neumann had mastered three methods." He went on to explain that the three methods were:- A facility with the symbolic manipulation of linear operators;
- An intuitive feeling for the logical structure of any new mathematical theory;
- An intuitive feeling for the combinatorial superstructure of new theories.{{sfn|Ulam|1983|p=96}}
Nuclear weapons
File:John von Neumann ID badge.png|thumb|upright=1.15|Von Neumann's wartime Los Alamos ID badge photo]]Manhattan Project
Beginning in the late 1930s, von Neumann developed an expertise in explosionsâ€”phenomena that are difficult to model mathematically. During this period, von Neumann was the leading authority of the mathematics of shaped charges. This led him to a large number of military consultancies, primarily for the Navy, which in turn led to his involvement in the Manhattan Project. The involvement included frequent trips by train to the project's secret research facilities at the Los Alamos Laboratory in a remote part of New Mexico.Von Neumann made his principal contribution to the atomic bomb in the concept and design of the explosive lenses that were needed to compress the plutonium core of the Fat Man weapon that was later dropped on Nagasaki. While von Neumann did not originate the "implosion" concept, he was one of its most persistent proponents, encouraging its continued development against the instincts of many of his colleagues, who felt such a design to be unworkable. He also eventually came up with the idea of using more powerful shaped charges and less fissionable material to greatly increase the speed of "assembly".{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|pp=130â€“133, 157â€“159}}When it turned out that there would not be enough uranium-235 to make more than one bomb, the implosive lens project was greatly expanded and von Neumann's idea was implemented. Implosion was the only method that could be used with the plutonium-239 that was available from the Hanford Site.{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|pp=239â€“245}} He established the design of the explosive lenses required, but there remained concerns about "edge effects" and imperfections in the explosives.{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|p=295}} His calculations showed that implosion would work if it did not depart by more than 5% from spherical symmetry.WEB,weblink Section 8.0 The First Nuclear Weapons, Nuclear Weapons Frequently Asked Questions, Carey, Sublette, January 8, 2016, After a series of failed attempts with models, this was achieved by George Kistiakowsky, and the construction of the Trinity bomb was completed in July 1945.{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|pp=320â€“327}}In a visit to Los Alamos in September 1944, von Neumann showed that the pressure increase from explosion shock wave reflection from solid objects was greater than previously believed if the angle of incidence of the shock wave was between 90Â° and some limiting angle. As a result, it was determined that the effectiveness of an atomic bomb would be enhanced with detonation some kilometers above the target, rather than at ground level.{{sfn|Macrae|1992|p=209}}{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|p=184}}(File:Implosion bomb animated.gif|thumb|left|Implosion mechanism)Von Neumann, four other scientists, and various military personnel were included in the target selection committee that was responsible for choosing the Japanese cities of Hiroshima and Nagasaki as the first targets of the atomic bomb. Von Neumann oversaw computations related to the expected size of the bomb blasts, estimated death tolls, and the distance above the ground at which the bombs should be detonated for optimum shock wave propagation and thus maximum effect. The cultural capital Kyoto, which had been spared the bombing inflicted upon militarily significant cities, was von Neumann's first choice,{{sfn|Macrae|1992|pp=242â€“245}} a selection seconded by Manhattan Project leader General Leslie Groves. However, this target was dismissed by Secretary of War Henry L. Stimson.{{sfn|Groves|1962|pp=268â€“276}}On July 16, 1945, von Neumann and numerous other Manhattan Project personnel were eyewitnesses to the first test of an atomic bomb detonation, which was code-named Trinity. The event was conducted as a test of the implosion method device, at the bombing range near Alamogordo Army Airfield, {{convert|35|mi}} southeast of Socorro, New Mexico. Based on his observation alone, von Neumann estimated the test had resulted in a blast equivalent to {{convert|5|ktonTNT|lk=on}} but Enrico Fermi produced a more accurate estimate of 10 kilotons by dropping scraps of torn-up paper as the shock wave passed his location and watching how far they scattered. The actual power of the explosion had been between 20 and 22 kilotons.{{sfn|Hoddeson|Henriksen|Meade|Westfall|1993|pp=371â€“372}} It was in von Neumann's 1944 papers that the expression "kilotons" appeared for the first time.{{sfn|Macrae|1992|p=205}} After the war, Robert Oppenheimer remarked that the physicists involved in the Manhattan project had "known sin". Von Neumann's response was that "sometimes someone confesses a sin in order to take credit for it."{{sfn|Macrae|1992|p=245}}Von Neumann continued unperturbed in his work and became, along with Edward Teller, one of those who sustained the hydrogen bomb project. He collaborated with Klaus Fuchs on further development of the bomb, and in 1946 the two filed a secret patent on "Improvement in Methods and Means for Utilizing Nuclear Energy", which outlined a scheme for using a fission bomb to compress fusion fuel to initiate nuclear fusion.{{sfn|Herken|2002|pages=171, 374}} The Fuchsâ€“von Neumann patent used radiation implosion, but not in the same way as is used in what became the final hydrogen bomb design, the Tellerâ€“Ulam design. Their work was, however, incorporated into the "George" shot of Operation Greenhouse, which was instructive in testing out concepts that went into the final design.JOURNAL, Bernstein, Jeremy, John von Neumann and Klaus Fuchs: an Unlikely Collaboration, Physics in Perspective, 12, 1, 36â€“50, 2010, 10.1007/s00016-009-0001-1, 2010PhP....12...36B, The Fuchsâ€“von Neumann work was passed on to the Soviet Union by Fuchs as part of his nuclear espionage, but it was not used in the Soviets' own, independent development of the Tellerâ€“Ulam design. The historian Jeremy Bernstein has pointed out that ironically, "John von Neumann and Klaus Fuchs, produced a brilliant invention in 1946 that could have changed the whole course of the development of the hydrogen bomb, but was not fully understood until after the bomb had been successfully made."For his wartime services, von Neumann was awarded the Navy Distinguished Civilian Service Award in July 1946, and the Medal for Merit in October 1946.{{sfn|Macrae|1992|p=208}}Atomic Energy Commission
In 1950, von Neumann became a consultant to the Weapons Systems Evaluation Group (WSEG),{{sfn|Macrae|1992|pp=350â€“351}} whose function was to advise the Joint Chiefs of Staff and the United States Secretary of Defense on the development and use of new technologies.NEWS, Weapons' Values to be Appraised,weblink December 15, 1948, Spokane Daily Chronicle, January 8, 2015, He also became an adviser to the Armed Forces Special Weapons Project (AFSWP), which was responsible for the military aspects on nuclear weapons. Over the following two years, he became a consultant to the Central Intelligence Agency (CIA), a member of the influential General Advisory Committee of the Atomic Energy Commission, a consultant to the newly established Lawrence Livermore National Laboratory, and a member of the Scientific Advisory Group of the United States Air Force.{{sfn|Macrae|1992|pp=350â€“351}}In 1955, von Neumann became a commissioner of the AEC. He accepted this position and used it to further the production of compact hydrogen bombs suitable for Intercontinental ballistic missile delivery. He involved himself in correcting the severe shortage of tritium and lithium 6 needed for these compact weapons, and he argued against settling for the intermediate-range missiles that the Army wanted. He was adamant that H-bombs delivered into the heart of enemy territory by an ICBM would be the most effective weapon possible, and that the relative inaccuracy of the missile wouldn't be a problem with an H-bomb. He said the Russians would probably be building a similar weapon system, which turned out to be the case.{{sfn|Heims|1980|p=276}}{{sfn|Macrae|1992|pp=367â€“369}} Despite his disagreement with Oppenheimer over the need for a crash program to develop the hydrogen bomb, he testified on the latter's behalf at the 1954 Oppenheimer security hearing, at which he asserted that Oppenheimer was loyal, and praised him for his helpfulness once the program went ahead.Shortly before his death from cancer, von Neumann headed the United States government's top secret ICBM committee, which would sometimes meet in his home. Its purpose was to decide on the feasibility of building an ICBM large enough to carry a thermonuclear weapon. Von Neumann had long argued that while the technical obstacles were sizable, they could be overcome in time. The SM-65 Atlas passed its first fully functional test in 1959, two years after his death. The feasibility of an ICBM owed as much to improved, smaller warheads as it did to developments in rocketry, and his understanding of the former made his advice invaluable.{{sfn|Macrae|1992|pp=359â€“365}}Mutual assured destruction
File:Redwing Mohawk 002.jpg|thumb|right|Operation RedwingOperation RedwingVon Neumann is credited with developing the equilibrium strategy of mutual assured destruction (MAD). He also "moved heaven and earth" to bring MAD about. His goal was to quickly develop ICBMs and the compact hydrogen bombs that they could deliver to the USSR, and he knew the Soviets were doing similar work because the CIA interviewed German rocket scientists who were allowed to return to Germany, and von Neumann had planted a dozen technical people in the CIA. The Soviets considered that bombers would soon be vulnerable, and they shared von Neumann's view that an H-bomb in an ICBM was the ne plus ultra of weapons; they believed that whoever had superiority in these weapons would take over the world, without necessarily using them.{{sfn|Macrae|1992|pp=362â€“363}} He was afraid of a "missile gap" and took several more steps to achieve his goal of keeping up with the Soviets:- He modified the ENIAC by making it programmable and then wrote programs for it to do the H-bomb calculations verifying that the Teller-Ulam design was feasible and to develop it further.
- Through the Atomic Energy Commission, he promoted the development of a compact H-bomb that would fit in an ICBM.
- He personally interceded to speed up the production of lithium-6 and tritium needed for the compact bombs.
- He caused several separate missile projects to be started, because he felt that competition combined with collaboration got the best results.{{sfn|Heims|1980|pp=258â€“260}}
Computing
Von Neumann was a founding figure in computing.{{sfn|Goldstine|1980|pp=167â€“178}} Von Neumann was the inventor, in 1945, of the merge sort algorithm, in which the first and second halves of an array are each sorted recursively and then merged.{{sfn|Knuth|1998|p=159}}BOOK, Knuth
, Donald E.
, Donald Knuth
, Papers of John von Neumann on computing and computer theory
, Aspray
, W.
, Burks
, A.
, MIT Press
, 1987
, Cambridge
, 978-0-262-22030-9
, 89â€“95
, Von Neumann's First Computer Program
,weblink
, Von Neumann wrote the 23 pages long sorting program for the EDVAC in ink. On the first page, traces of the phrase "TOP SECRET", which was written in pencil and later erased, can still be seen. He also worked on the philosophy of artificial intelligence with Alan Turing when the latter visited Princeton in the 1930s.{{sfn|Macrae|1992|pp=183â€“184}}Von Neumann's hydrogen bomb work was played out in the realm of computing, where he and StanisÅ‚aw Ulam developed simulations on von Neumann's digital computers for the hydrodynamic computations. During this time he contributed to the development of the Monte Carlo method, which allowed solutions to complicated problems to be approximated using random numbers.{{sfn|Macrae|1992|pp=334â€“335}} File:Flow chart of Planning and coding of problems for an electronic computing instrument, 1947.jpg|thumb|Flow chartFlow chartVon Neumann's algorithm for simulating a fair coin with a biased coin is used in the "software whitening" stage of some hardware random number generators.JOURNAL
, Donald E.
, Donald Knuth
, Papers of John von Neumann on computing and computer theory
, Aspray
, W.
, Burks
, A.
, MIT Press
, 1987
, Cambridge
, 978-0-262-22030-9
, 89â€“95
, Von Neumann's First Computer Program
,weblink
, von Neumann
, John
, Various techniques used in connection with random digits
, National Bureau of Standards Applied Math Series
, 1951
, 12
, 36
, , John
, Various techniques used in connection with random digits
, National Bureau of Standards Applied Math Series
, 1951
, 12
, 36
Because using lists of "truly" random numbers was extremely slow, von Neumann developed a form of making pseudorandom numbers, using the middle-square method. Though this method has been criticized as crude, von Neumann was aware of this: he justified it as being faster than any other method at his disposal, writing that "Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin."
JOURNAL
, Von Neumann
, John
, Various techniques used in connection with random digits
, National Bureau of Standards Applied Mathematics Series
, 1951
, 12
, 36â€“38
,weblink
, , John
, Various techniques used in connection with random digits
, National Bureau of Standards Applied Mathematics Series
, 1951
, 12
, 36â€“38
,weblink
Von Neumann also noted that when this method went awry it did so obviously, unlike other methods which could be subtly incorrect.
While consulting for the Moore School of Electrical Engineering at the University of Pennsylvania on the EDVAC project, von Neumann wrote an incomplete First Draft of a Report on the EDVAC. The paper, whose premature distribution nullified the patent claims of EDVAC designers J. Presper Eckert and John Mauchly, described a computer architecture in which the data and the program are both stored in the computer's memory in the same address space. This architecture is the basis of most modern computer designs, unlike the earliest computers that were "programmed" using a separate memory device such as a paper tape or plugboard. Although the single-memory, stored program architecture is commonly called von Neumann architecture as a result of von Neumann's paper, the architecture was based on the work of Eckert and Mauchly, inventors of the ENIAC computer at the University of Pennsylvania.WEB,weblink John W. Mauchly and the Development of the ENIAC Computer, University of Pennsylvania, January 27, 2017, John von Neumann consulted for the Army's Ballistic Research Laboratory, most notably on the ENIAC project,{{sfn|Macrae|1992|pp=279â€“283}} as a member of its Scientific Advisory Committee.WEB
, The electronics of the new ENIAC ran at one-sixth the speed, but this in no way degraded the ENIAC's performance, since it was still entirely I/O bound. Complicated programs could be developed and debugged in days rather than the weeks required for plugboarding the old ENIAC. Some of von Neumann's early computer programs have been preserved.BOOK
, Knuth
, Donald E.
, Donald Knuth
, Selected papers on computer science (Center for the Study of Language and Information â€“ Lecture Notes)
, CSLI Publications Cambridge University Press
, Stanford, Calif. Cambridge, Mass.
, 1996
, 978-1-881526-91-9
, The next computer that von Neumann designed was the IAS machine at the Institute for Advanced Study in Princeton, New Jersey. He arranged its financing, and the components were designed and built at the RCA Research Laboratory nearby. John von Neumann recommended that the IBM 701, nicknamed the defense computer, include a magnetic drum. It was a faster version of the IAS machine and formed the basis for the commercially successful IBM 704.BOOK
, Donald E.
, Donald Knuth
, Selected papers on computer science (Center for the Study of Language and Information â€“ Lecture Notes)
, CSLI Publications Cambridge University Press
, Stanford, Calif. Cambridge, Mass.
, 1996
, 978-1-881526-91-9
, RÃ©dei
, MiklÃ³s
, John Von Neumann: Selected Letters
, The American Mathematics Society and The London Mathematical Society
, 978-0-8218-9126-1
, 73 ff
, Letter to R. S. Burlington.
,weblink
, {{sfn|Dyson|2012|pp=267â€“268, 287}}Stochastic computing was first introduced in a pioneering paper by von Neumann in 1953.BOOK
, MiklÃ³s
, John Von Neumann: Selected Letters
, The American Mathematics Society and The London Mathematical Society
, 978-0-8218-9126-1
, 73 ff
, Letter to R. S. Burlington.
,weblink
, John
, von Neumann
, F.
, BrÃ³dy
, Tibor
, VÃ¡mos
, 1995
, Probabilistic logics and the synthesis of reliable organisms from unreliable components
, The Neumann Compendium
, World Scientific
, 567â€“616
, 978-981-02-2201-7
, However, the theory could not be implemented until advances in computing of the 1960s.CONFERENCE
, von Neumann
, F.
, BrÃ³dy
, Tibor
, VÃ¡mos
, 1995
, Probabilistic logics and the synthesis of reliable organisms from unreliable components
, The Neumann Compendium
, World Scientific
, 567â€“616
, 978-981-02-2201-7
, Petrovic
, R.
, Siljak
, D.
, Multiplication by means of coincidence
, 1962
, ACTES Proc. of 3rd Int. Analog Comp. Meeting
, JOURNAL
, R.
, Siljak
, D.
, Multiplication by means of coincidence
, 1962
, ACTES Proc. of 3rd Int. Analog Comp. Meeting
, Afuso
, C.
, Quart. Tech. Prog. Rept
, Department of Computer Science, University of Illinois at Urbana-Champaign, Illinois
, 1964
, , C.
, Quart. Tech. Prog. Rept
, Department of Computer Science, University of Illinois at Urbana-Champaign, Illinois
, 1964
Cellular automata, DNA and the universal constructor
{{See also|von Neumann cellular automaton|von Neumann universal constructor|von Neumann neighborhood|von Neumann Probe}}(File:Nobili Pesavento 2reps.png|right|thumb|upright=1.8|The first implementation of von Neumann's self-reproducing universal constructor.{{Citation|journal=Artificial Life| title=An implementation of von Neumann's self-reproducing machine| year=1995| first=Umberto| last=Pesavento|volume=2|issue=4|pages=337â€“354|url=http://dragonfly.tam.cornell.edu/~pesavent/pesavento_self_reproducing_machine.pdf|archiveurl=https://web.archive.org/web/20070621164824weblink |archivedate=June 21, 2007 |doi=10.1162/artl.1995.2.337|pmid=8942052}} Three generations of machine are shown: the second has nearly finished constructing the third. The lines running to the right are the tapes of genetic instructions, which are copied along with the body of the machines.)(File:VonNeumann CA demo.gif|right|frame|A simple configuration in von Neumann's cellular automaton. A binary signal is passed repeatedly around the blue wire loop, using excited and quiescent ordinary transmission states. A confluent cell duplicates the signal onto a length of red wire consisting of special transmission states. The signal passes down this wire and constructs a new cell at the end. This particular signal (1011) codes for an east-directed special transmission state, thus extending the red wire by one cell each time. During construction, the new cell passes through several sensitised states, directed by the binary sequence.)Von Neumann's rigorous mathematical analysis of the structure of self-replication (of the semiotic relationship between constructor, description and that which is constructed), preceded the discovery of the structure of DNA.{{sfnb|Rocha|2015|pp=25â€“27}}Von Neumann created the field of cellular automata without the aid of computers, constructing the first self-replicating automata with pencil and graph paper., 1966
, von Neumann
, John
, Arthur W. Burks
, Theory of Self-Reproducing Automata
, University of Illinois Press
, Urbana and London
, 978-0-598-37798-2
,weblink
, PDF
, , von Neumann
, John
, Arthur W. Burks
, Theory of Self-Reproducing Automata
, University of Illinois Press
, Urbana and London
, 978-0-598-37798-2
,weblink
, A Self-Reproducing Interstellar Probe
, Robert A., Jr.
, Freitas
, Journal of the British Interplanetary Society
, 33
, 251â€“264
, 1980
, 1980JBIS...33..251F
,weblink
, January 9, 2015
, Von Neumann investigated the question of whether modelling evolution on a digital computer could solve the complexity problem in programming.Beginning in 1949, von Neumann's design for a self-reproducing computer program is considered the world's first computer virus, and he is considered to be the theoretical father of computer virology.{{sfn|Filiol|2005|pp=19â€“38}}, Robert A., Jr.
, Freitas
, Journal of the British Interplanetary Society
, 33
, 251â€“264
, 1980
, 1980JBIS...33..251F
,weblink
, January 9, 2015
Weather systems and global warming
As part of his research into weather forecasting, von Neumann founded the "Meteorological Program" in Princeton in 1946, securing funding for his project from the US Navy.Weather ArchitectureBy Jonathan Hill (Routledge, 2013), page 216 Von Neumann and his appointed assistant on this project, Jule Gregory Charney, wrote the world's first climate modelling software, and used it to perform the world's first numerical weather forecasts on the ENIAC computer; von Neumann and his team published the results as Numerical Integration of the Barotropic Vorticity Equation in 1950.JOURNAL, Charney
, J. G.
, FjÃ¶rtoft
, R.
, Neumann
, J.
, Numerical Integration of the Barotropic Vorticity Equation
, Tellus
, 1950
, 2
, 4
, 237â€“254
, 10.1111/j.2153-3490.1950.tb00336.x, 1950TellA...2..237C
,
Together they played a leading role in efforts to integrate sea-air exchanges of energy and moisture into the study of climate.Gilchrist, Bruce, WEB,weblink Remembering Some Early Computers, 1948-1960, 2006-12-12, bot: unknown,weblink" title="web.archive.org/web/20061212200023weblink">weblink December 12, 2006, , Columbia University EPIC, 2006, pp.7-9. (archived 2006) Contains some autobiographical material on Gilchrist's use of the IAS computer beginning in 1952. Von Neumann proposed as the research program for climate modeling: "The approach is to first try short-range forecasts, then long-range forecasts of those properties of the circulation that can perpetuate themselves over arbitrarily long periods of time, and only finally to attempt forecast for medium-long time periods which are too long to treat by simple hydrodynamic theory and too short to treat by the general principle of equilibrium theory."Intraseasonal Variability in the Atmosphere-Ocean Climate System, By William K.-M. Lau, Duane E. Waliser (Springer 2011), page V
Von Neumann's research into weather systems and meteorological prediction led him to propose manipulating the environment by spreading colorants on the polar ice caps to enhance absorption of solar radiation (by reducing the albedo),{{sfn|Macrae|1992|p=332}}{{sfn|Heims|1980|pp=236â€“247}} thereby inducing global warming.{{sfn|Macrae|1992|p=332}}{{sfn|Heims|1980|pp=236â€“247}} Von Neumann proposed a theory of global warming as a result of the activity of humans, noting that the Earth was only {{convert|6|F-change|C-change}} colder during the last glacial period, he wrote in 1955: "Carbon dioxide released into the atmosphere by industry's burning of coal and oil - more than half of it during the last generation - may have changed the atmosphere's composition sufficiently to account for a general warming of the world by about one degree Fahrenheit."{{sfn|Macrae|1992|p=16}}Engineering: Its Role and Function in Human Societyedited by William H. Davenport, Daniel I. Rosenthal (Elsevier 2016), page 266 However, von Neumann urged a degree of caution in any program of intentional human weather manufacturing: "What could be done, of course, is no index to what should be done... In fact, to evaluate the ultimate consequences of either a general cooling or a general heating would be a complex matter. Changes would affect the level of the seas, and hence the habitability of the continental coastal shelves; the evaporation of the seas, and hence general precipitation and glaciation levels; and so on... But there is little doubt that one could carry out the necessary analyses needed to predict the results, intervene on any desired scale, and ultimately achieve rather fantastic results.", J. G.
, FjÃ¶rtoft
, R.
, Neumann
, J.
, Numerical Integration of the Barotropic Vorticity Equation
, Tellus
, 1950
, 2
, 4
, 237â€“254
, 10.1111/j.2153-3490.1950.tb00336.x, 1950TellA...2..237C
,
Together they played a leading role in efforts to integrate sea-air exchanges of energy and moisture into the study of climate.Gilchrist, Bruce, WEB,weblink Remembering Some Early Computers, 1948-1960, 2006-12-12, bot: unknown,weblink" title="web.archive.org/web/20061212200023weblink">weblink December 12, 2006, , Columbia University EPIC, 2006, pp.7-9. (archived 2006) Contains some autobiographical material on Gilchrist's use of the IAS computer beginning in 1952. Von Neumann proposed as the research program for climate modeling: "The approach is to first try short-range forecasts, then long-range forecasts of those properties of the circulation that can perpetuate themselves over arbitrarily long periods of time, and only finally to attempt forecast for medium-long time periods which are too long to treat by simple hydrodynamic theory and too short to treat by the general principle of equilibrium theory."Intraseasonal Variability in the Atmosphere-Ocean Climate System, By William K.-M. Lau, Duane E. Waliser (Springer 2011), page V
Technological singularity hypothesis
{{See also|Technological singularity}}The first use of the concept of a (Wiktionary:singularity|singularity) in the technological context is attributed to von Neumann,The Technological Singularity by Murray Shanahan, (MIT Press, 2015), page 233 who according to Ulam discussed the "ever accelerating progress of technology and changes in the mode of human life, which gives the appearance of approaching some essential singularity in the history of the race beyond which human affairs, as we know them, could not continue."JOURNAL, Chalmers, David, 2010, The singularity: a philosophical analysis, Journal of Consciousness Studies, 17, 9â€“10, 7â€“65, This concept was fleshed out later in the book Future Shock by Alvin Toffler.Cognitive abilities
Other mathematicians were stunned by von Neumann's ability to instantaneously perform complex operations in his head.{{sfn|Goldstine|1980|pp=171}} As a six-year-old, he could divide two eight-digit numbers in his head and converse in Ancient Greek.Poundstone, William, Prisoner's Dilemma, New York: Doubleday 1992 When he was sent at the age of 15 to study advanced calculus under analyst GÃ¡bor SzegÅ‘, SzegÅ‘ was so astounded with the boy's talent in mathematics that he was brought to tears on their first meeting.{{sfn|Glimm|Impagliazzo|Singer|1990|p=5}}Nobel Laureate Hans Bethe said "I have sometimes wondered whether a brain like von Neumann's does not indicate a species superior to that of man",{{sfn|Blair|1957|p=90}} and later Bethe wrote that "[von Neumann's] brain indicated a new species, an evolution beyond man".{{sfn|Macrae|1992|p=backcover}} Seeing von Neumann's mind at work, Eugene Wigner wrote, "one had the impression of a perfect instrument whose gears were machined to mesh accurately to a thousandth of an inch."{{sfn|Wigner|Mehra|Wightman|1995|p=129}} Paul Halmos states that "von Neumann's speed was awe-inspiring." Israel Halperin said: "Keeping up with him was ... impossible. The feeling was you were on a tricycle chasing a racing car."Kaplan, Michael and Kaplan, Ellen (2006) Chances areâ€“: adventures in probability. Viking. Edward Teller admitted that he "never could keep up with him".JOURNAL, John von Neumann, Edward, Teller, Edward Teller, Bulletin of the Atomic Scientists, April 1957, 13, 4, 150â€“151, Teller also said "von Neumann would carry on a conversation with my 3-year-old son, and the two of them would talk as equals, and I sometimes wondered if he used the same principle when he talked to the rest of us."WEB, Nowak, Amram, John Von Neumann a documentary,weblink Mathematical Association of America, Committee on Educational Media, English, 1 January 1966, 177660043, , DVD version (2013) {{oclc|897933992}}. Peter Lax wrote "Von Neumann was addicted to thinking, and in particular to thinking about mathematics".{{sfn|Glimm|Impagliazzo|Singer|1990}}When George Dantzig brought von Neumann an unsolved problem in linear programming "as I would to an ordinary mortal", on which there had been no published literature, he was astonished when von Neumann said "Oh, that!", before offhandedly giving a lecture of over an hour, explaining how to solve the problem using the hitherto unconceived theory of duality.{{sfn|Mirowski|2002|p=258}}Lothar Wolfgang Nordheim described von Neumann as the "fastest mind I ever met",{{sfn|Goldstine|1980|pp=171}} and Jacob Bronowski wrote "He was the cleverest man I ever knew, without exception. He was a genius."{{sfn|Bronowski|1974|p=433}} George PÃ³lya, whose lectures at ETH ZÃ¼rich von Neumann attended as a student, said "Johnny was the only student I was ever afraid of. If in the course of a lecture I stated an unsolved problem, the chances were he'd come to me at the end of the lecture with the complete solution scribbled on a slip of paper."{{sfn|PetkoviÄ‡|2009|p=157}} Eugene Wigner writes: "'Jancsi,' I might say, 'Is angular momentum always an integer of h?' He would return a day later with a decisive answer: 'Yes, if all particles are at rest.'... We were all in awe of Jancsi von Neumann".The Recollections of Eugene P. Wigner, by Eugene Paul Wigner, Andrew Szanton, Springer, 2013, page 106 Enrico Fermi told physicist Herbert L. Anderson: "You know, Herb, Johnny can do calculations in his head ten times as fast as I can! And I can do them ten times as fast as you can, Herb, so you can see how impressive Johnny is!"Fermi Remembered, James W. Cronin, University of Chicago Press (2004), page 236Halmos recounts a story told by Nicholas Metropolis, concerning the speed of von Neumann's calculations, when somebody asked von Neumann to solve the famous fly puzzle:WEB,weblink Fly Puzzle (Two Trains Puzzle), Mathworld.wolfram.com, February 15, 2014, February 25, 2014, Eugene Wigner told a similar story, only with a swallow instead of a fly, and says it was Max Born who posed the question to von Neumann in the 1920s.WEB, John von Neumann â€“ A Documentary,weblink The Mathematical Association of American, 22 February 2016, 16m46sâ€“19m04s, 1966, Von Neumann was also noted for his eidetic memory (sometimes called photographic memory). Herman Goldstine wrote:}}Von Neumann was reportedly able to memorize the pages of telephone directories. He entertained friends by asking them to randomly call out page numbers; he then recited the names, addresses and numbers therein.{{sfn|Blair|1957|p=90}}John von Neumann: Life, Work, and Legacy Institute of Advanced Study, PrincetonMathematical legacy
"It seems fair to say that if the influence of a scientist is interpreted broadly enough to include impact on fields beyond science proper, then John von Neumann was probably the most influential mathematician who ever lived," wrote MiklÃ³s RÃ©dei in John von Neumann: Selected Letters.{{sfn|von Neumann|2005|p=7}} James Glimm wrote: "he is regarded as one of the giants of modern mathematics".{{sfn|Glimm|Impagliazzo|Singer|1990|p=vii}} The mathematician Jean DieudonnÃ© said that von Neumann "may have been the last representative of a once-flourishing and numerous group, the great mathematicians who were equally at home in pure and applied mathematics and who throughout their careers maintained a steady production in both directions",{{sfn|DieudonnÃ© |2008|p=90}} while Peter Lax described him as possessing the "most scintillating intellect of this century".{{sfn|Glimm|Impagliazzo|Singer|1990|p=7}} In the foreword of MiklÃ³s RÃ©dei's Selected Letters, Peter Lax wrote, "To gain a measure of von Neumann's achievements, consider that had he lived a normal span of years, he would certainly have been a recipient of a Nobel Prize in economics. And if there were Nobel Prizes in computer science and mathematics, he would have been honored by these, too. So the writer of these letters should be thought of as a triple Nobel laureate or, possibly, a {{frac|3|1|2}}-fold winner, for his work in physics, in particular, quantum mechanics".{{sfn|von Neumann|2005|p=xiii}}Illness and death
(File:John von neumann tomb 2004.jpg|thumb|right|Von Neumann's gravestone)In 1955, von Neumann was diagnosed with what was either bone or pancreatic cancer.While there is a general agreement that the initially discovered bone tumour was a secondary growth, sources differ as to the location of the primary cancer. While Macrae gives it as pancreatic, the Life magazine article says it was prostate. He was not able to accept the proximity of his own demise, and the shadow of impending death instilled great fear in him.BOOK, Read, Colin, The Portfolio Theorists: von Neumann, Savage, Arrow and Markowitz, Great Minds in Finance,weblink September 29, 2017, 2012, Palgrave Macmillan, 978-0230274143, 65, When von Neumann realised he was incurably ill his logic forced him to realise that he would cease to exist... [a] fate which appeared to him unavoidable but unacceptable., He invited a Roman Catholic priest, Father Anselm Strittmatter, O.S.B., to visit him for consultation. Von Neumann reportedly said, "So long as there is the possibility of eternal damnation for nonbelievers it is more logical to be a believer at the end", essentially saying that Pascal had a point, referring to Pascal's Wager. He had earlier confided to his mother, "There probably has to be a God. Many things are easier to explain if there is than if there isn't."{{harvnb|Macrae|1992|page=379}}"{{harvnb|Dransfield|Dransfield|2003|p=124}} "He was brought up in a Hungary in which anti-Semitism was commonplace, but the family were not overly religious, and for most of his adult years von Neumann held agnostic beliefs."{{harvnb|Ayoub|2004|p=170}} "On the other hand, von Neumann, giving in to Pascal's wager on his death bed, received extreme unction." Father Strittmatter administered the last rites to him. Some of von Neumann's friends (such as Abraham Pais and Oskar Morgenstern) said they had always believed him to be "completely agnostic".{{harvnb|Pais|2006|p=109}} "He had been completely agnostic for as long as I had known him. As far as I could see this act did not agree with the attitudes and thoughts he had harbored for nearly all his life." Of this deathbed conversion, Morgenstern told Heims, "He was of course completely agnostic all his life, and then he suddenly turned Catholicâ€”it doesn't agree with anything whatsoever in his attitude, outlook and thinking when he was healthy."{{sfn|Poundstone|1993|p=194}} Father Strittmatter recalled that even after his conversion, von Neumann did not receive much peace or comfort from it, as he still remained terrified of death.{{sfn|Poundstone|1993|p=194}}Von Neumann was on his deathbed when he entertained his brother by reciting by heart and word-for-word the first few lines of each page of Goethe's Faust.{{sfn|Blair|1957|p=104}} He died at age 53 on February 8, 1957, at the Walter Reed Army Medical Center in Washington, D.C., under military security lest he reveal military secrets while heavily medicated. He was buried at Princeton Cemetery in Princeton, Mercer County, New Jersey.{{sfn|Macrae|1992|p=380}}Honors
File:Von Neumann crater 5103 h2 h3.jpg|thumb|right|240px|The von Neumann crater, on the far side of the MoonMoon- The John von Neumann Theory Prize of the Institute for Operations Research and the Management Sciences (INFORMS, previously TIMS-ORSA) is awarded annually to an individual (or group) who have made fundamental and sustained contributions to theory in operations research and the management sciences.WEB,weblink John von Neumann Theory Prize, Institute for Operations Research and the Management Sciences, May 17, 2016, yes,weblink May 13, 2016, mdy-all,
- The IEEE John von Neumann Medal is awarded annually by the Institute of Electrical and Electronics Engineers (IEEE) "for outstanding achievements in computer-related science and technology."WEB,weblink Institute of Electrical and Electronics Engineers, IEEE John von Neumann Medal, May 17, 2016,
- The John von Neumann Lecture is given annually at the Society for Industrial and Applied Mathematics (SIAM) by a researcher who has contributed to applied mathematics, and the chosen lecturer is also awarded a monetary prize.WEB,weblink Society for Industrial and Applied Mathematics, The John von Neumann Lecture, May 17, 2016,
- The crater von Neumann on the Moon is named after him.WEB,weblink Von Neumann, United States Geological Survey, May 17, 2016,
- Asteroid 22824 von Neumann was named in his honor.WEB,weblink 22824 von Neumann (1999 RP38), Jet Propulsion Laboratory, February 13, 2018, WEB,weblink (22824) von Neumann = 1999 RP38 = 1998 HR2, Minor Planet Center, February 13, 2018,
- The John von Neumann Center in Plainsboro Township, New Jersey, was named in his honor.NEWS,weblink NSF Supercomputer Program Looks Beyond Princeton Recall, The Scientist Magazine, Christopher, Anderson, November 27, 1989, May 17, 2016,
- The professional society of Hungarian computer scientists, John von Neumann Computer Society, is named after John von Neumann.WEB, Introducing the John von Neumann Computer Society, John von Neumann Computer Society,weblink May 20, 2008, yes,weblink" title="web.archive.org/web/20080429192308weblink">weblink April 29, 2008, It was closed in April 1989.{{sfn|Kent|Williams|1994|p=321}}
- On May 4, 2005, the United States Postal Service issued the American Scientists commemorative postage stamp series, a set of four 37-cent self-adhesive stamps in several configurations designed by artist Victor Stabin. The scientists depicted were von Neumann, Barbara McClintock, Josiah Willard Gibbs, and Richard Feynman.WEB,weblink American Scientists Issue, Smithsonian National Postal Museum, May 17, 2016,
- The John von Neumann Award of the Rajk LÃ¡szlÃ³ College for Advanced Studies was named in his honor, and has been given every year since 1995 to professors who have made an outstanding contribution to the exact social sciences and through their work have strongly influenced the professional development and thinking of the members of the college.WEB,weblink John von Neumann Award, dÃjaink â€“ Rajk, May 17, 2016,
- John von Neumann University was established in Hungary in 2016, as a successor to KecskemÃ©t College.John von Neumann University
Selected works
- 1923. On the introduction of transfinite numbers, 346â€“54.
- 1925. An axiomatization of set theory, 393â€“413.
- 1932. Mathematical Foundations of Quantum Mechanics, Beyer, R. T., trans., Princeton Univ. Press. 1996 edition: {{isbn|0-691-02893-1}}.
- 1937. BOOK, von Neumann, John, Halperin, Israel, Continuous geometries with a transition probability,weblink 634656, 1981, Memoirs of the American Mathematical Society, 34, 252, 978-0-8218-2252-4,
- 1944. Theory of Games and Economic Behavior, with Morgenstern, O., Princeton Univ. Press, online at archive.org. 2007 edition: {{isbn|978-0-691-13061-3}}.
- 1945. weblink" title="web.archive.org/web/20110503181603weblink">First Draft of a Report on the EDVAC
- 1948. "The general and logical theory of automata," in Cerebral Mechanisms in Behavior: The Hixon Symposium, Jeffress, L.A. ed., John Wiley & Sons, New York, N. Y, 1951, pp. 1â€“31, MR 0045446.
- 1960. BOOK, von Neumann, John, Continuous geometry,weblink Princeton University Press, Princeton Landmarks in Mathematics, 978-0-691-05893-1, 0120174, 1998,
- 1963. Collected Works of John von Neumann, Taub, A. H., ed., Pergamon Press. {{isbn|0-08-009566-6}}
- 1966. Theory of Self-Reproducing Automata, Burks, A. W., ed., University of Illinois Press. {{isbn|0-598-37798-0}}
See also
{{div col}}- John von Neumann (sculpture), Eugene, Oregon
- John von Neumann Award
- List of things named after John von Neumann
- List of pioneers in computer science
- Self-replicating spacecraft
- Von Neumannâ€“Bernaysâ€“GÃ¶del set theory
- Von Neumann algebra
- Von Neumann architecture
- Von Neumann bicommutant theorem
- Von Neumann conjecture
- Von Neumann entropy
- Von Neumann programming languages
- Von Neumann regular ring
- Von Neumann universal constructor
- Von Neumann universe
- Von Neumann's trace inequality
- The Martians (scientists)
- Donald B. Gillies, Ph.D. student{{MathGenealogy |id=53213}}. Retrieved March 17, 2015.
- Israel Halperin, Ph.D. studentWhile Israel Halperin's thesis advisor is often listed as Salomon Bochner, this may be because "Professors at the university direct doctoral theses but those at the Institute do not. Unaware of this, in 1934 I asked von Neumann if he would direct my doctoral thesis. He replied Yes." (BOOK, Halperin, Israel, 1990, The Extraordinary Inspiration of John von Neumann, 50, 15â€“17, 10.1090/pspum/050/1067747, Proceedings of Symposia in Pure Mathematics, 978-0-8218-1487-1, )
Notes
{{Reflist|20em}}References
- BOOK, Ayoub, Raymond George, Musings Of The Masters: An Anthology Of Mathematical Reflections, 2004, MAA, Washington, D.C., 978-0-88385-549-2, 56537093, harv,
- JOURNAL, Blair, Clay, Jr., Clay Blair,weblink Passing of a Great Mind, Life (magazine), Life, 89â€“104, February 25, 1957, harv,
- BOOK, Blume, Lawrence E., Lawrence E. Blume, Convexity, 2008, The New Palgrave Dictionary of Economics, 225â€“226, Steven N. Durlauf, Durlauf, Steven N., Blume, Lawrence E., Palgrave Macmillan, New York, Second,weblink 10.1057/9780230226203.0315, harv, 978-0-333-78676-5,
- BOOK, Bronowski, Jacob, Jacob Bronowski, 1974, The Ascent of Man, Boston, Little, Brown, 978-0-316-56940-8, 763593, harv,
- BOOK, Dawson, John W., Jr., John W. Dawson, Jr., 1997, Logical Dilemmas: The Life and Work of Kurt GÃ¶del, Wellesley, Massachusetts, A. K. Peters, 978-1-56881-256-4, harv,
- BOOK, DieudonnÃ©, J., Jean DieudonnÃ©, Von Neumann, Johann (or John), 7th, Complete Dictionary of Scientific Biography, 14, Detroit, Charles Scribner's Sons, 2008, 88â€“92 Gale Virtual Reference Library, Gillispie, C. C., Charles Coulston Gillispie, 978-0-684-31559-1, 187313311, harv,
- BOOK, Doran, Robert S., Robert S. Doran, John, von Neumann, Marshall Harvey, Stone, Marshall Harvey Stone, Richard Kadison, Richard V., Kadison, Operator Algebras, Quantization, and Noncommutative Geometry: A Centennial Celebration Honoring John von Neumann and Marshall H. Stone, American Mathematical Society, Washington, D.C., 2004, 978-0-8218-3402-2, harv,
- BOOK, Dransfield, Robert, Don, Dransfield, Key Ideas in Economics, 2003, Nelson Thornes, Cheltenham, 978-0-7487-7081-6, 52395899, harv,
- BOOK, Dyson, George, George Dyson (science historian), Darwin among the machines the evolution of global intelligence, Perseus Books, 1998, Cambridge, Massachusetts, 978-0-7382-0030-9, 757400572, harv,
- BOOK, Dyson, George, George Dyson (science historian), 2012, Turing's Cathedral: the Origins of the Digital Universe, Pantheon Books, New York, 978-0-375-42277-5, 745979775, harv,
- BOOK, Filiol, Ã‰ric, 2005, Computer viruses: from theory to applications, Volume 1, New York, Springer, 9â€“38, 978-2-287-23939-7, 224779290, harv,
- BOOK, Glimm, James, Impagliazzo, John, Singer, Isadore Manuel, The Legacy of John von Neumann, American Mathematical Society, 1990, 978-0-8218-4219-5, harv,
- BOOK, Goldstine, Herman, Herman Goldstine, The Computer from Pascal to von Neumann, Princeton University Press, 1980, 978-0-691-02367-0, harv,
- BOOK, Groves, Leslie, Leslie Groves, Now it Can be Told: The Story of the Manhattan Project, New York, Harper & Row, 1962, 978-0-306-70738-4, 537684, harv,
- BOOK, Heims, Steve J., John von Neumann and Norbert Wiener, from Mathematics to the Technologies of Life and Death, 1980, MIT Press, Cambridge, Massachusetts, 978-0-262-08105-4, harv,
- BOOK, Henderson, Harry, Mathematics: Powerful Patterns Into Nature and Society, Chelsea House, New York, 2007, 978-0-8160-5750-4, 840438801, harv,
- BOOK, Herken, Gregg, Brotherhood of the Bomb: The Tangled Lives and Loyalties of Robert Oppenheimer, Ernest Lawrence, and Edward Teller, Holt Paperbacks, New York, New York, 2002, 978-0-8050-6589-3, 48941348, harv,
- BOOK, Hoddeson, Lillian, Paul W., Henriksen, Roger A., Meade, Catherine L., Westfall, Critical Assembly: A Technical History of Los Alamos During the Oppenheimer Years, 1943â€“1945, New York, Cambridge University Press, 1993, 978-0-521-44132-2, 26764320, harv,
- BOOK, Kent, Allen, James G., Williams, Encyclopedia of Computer Science and Technology, Volume=30, Supplement 15, New York, Dekker, 1994, 978-0-8247-2283-8, 832033269, harv,
- BOOK, Knuth, Donald, Donald Knuth, 1998, The Art of Computer Programming: Volume 3 Sorting and Searching, 978-0-201-89685-5, Addison-Wesley, Boston, harv,
- BOOK, Macrae, Norman, Norman Macrae, John von Neumann: The Scientific Genius Who Pioneered the Modern Computer, Game Theory, Nuclear Deterrence, and Much More, 1992, Pantheon Press, 978-0-679-41308-0, harv,
- BOOK, Mirowski, Philip, Philip Mirowski, Machine Dreams: Economics Becomes a Cyborg Science, Cambridge University Press, 2002, New York, 978-0-521-77283-9, 45636899, harv,
- BOOK, Mitchell, Melanie, Complexity: A Guided Tour, New York, Oxford University Press, 2009, 978-0-19-512441-5, 216938473, harv,
- BOOK, Morgenstern, Oskar, Oskar Morgenstern, Thompson, Gerald L., Gerald L. Thompson, Mathematical Theory of Expanding and Contracting Economies, Lexington Books, D. C. Heath and Company, 1976, Lexington, Massachusetts, 978-0-669-00089-4, harv,
- BOOK, Nasar, Sylvia, Sylvia Nasar, 2001, A Beautiful Mind : a Biography of John Forbes Nash, Jr., Winner of the Nobel Prize in Economics, 1994, London, Simon & Schuster, 978-0-7432-2457-4, harv,
- BOOK, Pais, Abraham, Abraham Pais, J. Robert Oppenheimer: A Life, 2006, Oxford University Press, Oxford, 978-0-19-516673-6, 475574884, harv,
- BOOK, Petz, D., Redi, M. R., 1995, John von Neumann And The Theory Of Operator Algebras, The Neumann Compendium, World Scientific, Singapore, 978-981-02-2201-7, 32013468, harv,
- BOOK, PetkoviÄ‡, Miodrag, Miodrag PetkoviÄ‡, 2009, Famous puzzles of great mathematicians, American Mathematical Society, 157, 978-0-8218-4814-2, harv,
- BOOK, Poundstone, William, William Poundstone, Prisoner's Dilemma, 1993, Random House Digital, 978-0-385-41580-4, harv,
- JOURNAL, RÃ¨dei, Miklos, Miklos RÃ¨dei, Unsolved problems in mathematics, Mathematical Intelligencer, 7â€“12, 1999, RÃ¨dei,
- BOOK, Regis, Ed, Ed Regis (author), 1987, Who Got Einstein's Office?: Eccentricity and Genius at the Institute for Advanced Study, Addison-Wesley, 978-0-201-12065-3, 15548856, Reading, Massachusetts, harv,
- BOOK, Rocha, L.M., Luis M. Rocha, Lecture Notes of I-585-Biologically Inspired Computing Course, Indiana University, Von Neumann and Natural Selection, 2015,weblink February 6, 2016, harv,
- BOOK, Rockafellar, R. T., R. Tyrrell Rockafellar, Convex Algebra and Duality in Dynamic Models of production, Mathematical Models in Economics (Proc. Sympos. and Conf. von Neumann Models, Warsaw, 1972), Josef, Loz, Maria, Loz, Elsevier North-Holland Publishing and Polish Academy of Sciences (PAN), Amsterdam, 1974, 839117596, harv,
- BOOK, Rockafellar, R. T., R. Tyrrell Rockafellar, Convex analysis, Princeton University Press, Princeton, New Jersey, 1970, 978-0-691-08069-7, 64619, harv,
- BOOK, Rota, Gian-Carlo, Gian-Carlo Rota, Cooper, Necia Grant, Eckhardt, Roger, Shera, Nancy, 1989, The Lost Cafe, 23â€“32, From Cardinals To Chaos: Reflections On The Life And Legacy Of StanisÅ‚aw Ulam, Cambridge, Cambridge University Press, 978-0-521-36734-9, 18290810, harv,
- BOOK, Schneider, G. Michael, Judith, Gersting, Bo, Brinkman, Invitation to Computer Science, Boston, Cengage Learning, 2015, 978-1-305-07577-1, 889643614, harv,
- BOOK, Ulam, StanisÅ‚aw, StanisÅ‚aw Ulam, Adventures of a Mathematician, New York, Charles Scribner's Sons, 1983, 978-0-684-14391-0, 1528346, harv,
- BOOK, Van Heijenoort, Jean, Jean van Heijenoort, 1967, From Frege to GÃ¶del: a Source Book in Mathematical Logic, 1879â€“1931, Cambridge, Massachusetts, Harvard University Press, 978-0-674-32450-3, 523838, harv,
- BOOK, von Neumann, John, Heywood, Robert B., The Works of the Mind: The Mathematician, 1947, University of Chicago Press, Chicago, 752682744, harv,
- BOOK, von Neumann, John, Taub, A. H., The Point Source Solution, John von Neumann. Collected Works, 1903â€“1957, Volume 6: Theory of Games, Astrophysics, Hydrodynamics and Meteorology Elmsford, New York, Pergamon Press, 1963a, 219â€“237, 978-0-08-009566-0, 493423386, harv,
- BOOK, von Neumann, John, Taub, A. H., Theory of Detonation Waves. Progress Report to the National Defense Research Committee Div. B, OSRD-549, 1st pub. April 1, 1942,weblink 19 May 2016, John von Neumann: Collected Works, 1903â€“1957, Volume 6: Theory of Games, Astrophysics, Hydrodynamics and Meteorology, Pergamon Press, New York, 1963b, 205â€“218, 978-0-08-009566-0, 493423386, harv,
- BOOK, von Neumann, John, MiklÃ³s, RÃ©dei, John von Neumann: Selected letters, American Mathematical Society, History of Mathematics, 27, 2005, 978-0-8218-3776-4, harv,
- BOOK, Wigner, Eugene Paul, Jagdish, Mehra, A. S., Wightman, 1995, Volume 7, Part B, Philosophical Reflections and Syntheses, Berlin, Springer, 978-3-540-63372-3, harv,
- BOOK, Ye, Yinyu, Yinyu Ye, 1997,weblink The von Neumann growth model, 277â€“299, Interior point algorithms: Theory and analysis, Wiley, New York, 978-0-471-17420-2, 36746523, harv,
- (File:PD-icon.svg|18px){{FOLDOC}}
Further reading
Books- BOOK, Aspray, William, 1990, John von Neumann and the Origins of Modern Computing, Cambridge, Massachusetts, MIT Press, 978-0-262-01121-1, 21524368, 1990jvno.book.....A,
- BOOK, Mohammed, Dore, Chakravarty, Sukhamoy, Sukhamoy Chakraborty, Richard, Goodwin, Richard M. Goodwin, John Von Neumann and modern economics, Oxford, Clarendon, 1989, 978-0-19-828554-0, 18520691,
- BOOK, Halmos, Paul R., Paul Halmos, 1985, I Want To Be A Mathematician: an Automathography, Springer-Verlag, New York, 978-0-387-96078-4, 11497873,
- BOOK, Israel, Giorgio, Ana Millan Gasca, The World as a Mathematical Game: John von Neumann, Twentieth Century Scientist, Basel, BirkhÃ¤user, 2009, 978-3-7643-9896-5, 318641638,
- BOOK, von Neumann Whitman, Marina, Marina von Neumann Whitman, 2012, The Martian's Daughterâ€”A Memoir, University of Michigan Press, Anne Arbor, 978-0-472-03564-9, 844308382,
- BOOK, Redei, Miklos, 2005, John von Neumann: Selected Letters, American Mathematical Society, Providence, Rhode Island, 978-0-8218-3776-4, 60651134,
- BOOK, Slater, Robert, Portraits in Silicon, 1989, MIT Press, Cambridge, Massachusetts, 978-0-262-19262-0, 15630421,
- BOOK, Rockafellar, R. Tyrrell, R. Tyrrell Rockafellar, Monotone Processes of Convex and Concave Type, Memoirs of the American Mathematical Society, American Mathematical Society, Providence, Rhode Island, 77, 978-0-8218-1277-8, 1967, 1318941,
- BOOK, Vonneuman, Nicholas A., 1987, John von Neumann as Seen by His Brother, Meadowbrook, Pennsylvania, N.A. Vonneuman, 978-0-9619681-0-6, 17547196,
- Good Housekeeping Magazine, September 1956, "Married to a Man Who Believes the Mind Can Move the World"
- John von Neumann, A Documentary (60 min.), Mathematical Association of America
External links
{{Commons|JÃ¡nos Lajos Neumann|John von Neumann}}- {{MacTutor|id=Von_Neumann}}
- von Neumann's profile at Google Scholar
- Oral history interview with Alice R. Burks and Arthur W. Burks, Charles Babbage Institute, University of Minnesota, Minneapolis. Alice Burks and Arthur Burks describe ENIAC, EDVAC, and IAS computers, and John von Neumann's contribution to the development of computers.
- Oral history interview with Eugene P. Wigner, Charles Babbage Institute, University of Minnesota, Minneapolis.
- Oral history interview with Nicholas C. Metropolis, Charles Babbage Institute, University of Minnesota.
- Von Neumann vs. Dirac â€” from Stanford Encyclopedia of Philosophy
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