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Apollonius of Perga

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**Apollonius of Perga**(; ; late 3rd{{snd}}early 2nd centuries BC) was a Greek geometer and astronomer known for his theories on the topic of conic sections. Beginning from the theories of Euclid and Archimedes on the topic, he brought them to the state they were in just before the invention of analytic geometry. His definitions of the terms ellipse, parabola, and hyperbola are the ones in use today.Apollonius worked on many other topics, including astronomy. Most of the work has not survived except in fragmentary references in other authors. His hypothesis of eccentric orbits to explain the apparently aberrant motion of the planets, commonly believed until the Middle Ages, was superseded during the Renaissance.

## Life

For such an important contributor to the field of mathematics, scant biographical information remains. The 6th century Palestinian commentator, Eutocius of Ascalon, on Apolloniusâ€™ major work,*Conics*, states:Eutocius,

*Commentary on Conica*, Book I, Lines 5-10, to be found translated in {{harvnb|Apollonius of Perga|Thomas|1953|p=277}} â€œApollonius, the geometrician, ... came from Perga in Pamphylia in the times of Ptolemy Euergetes, so records Herakleios the biographer of Archimedes ....â€Perga at the time was a Hellenized city of Pamphylia in Anatolia. The ruins of the city yet stand. It was a center of Hellenistic culture. Euergetes, â€œbenefactor,â€ identifies Ptolemy III Euergetes, third Greek dynast of Egypt in the diadochi succession. Presumably, his â€œtimesâ€ are his regnum, 246-222/221 BC. Times are always recorded by ruler or officiating magistrate, so that if Apollonius was born earlier than 246, it would have been the â€œtimesâ€ of Euergetesâ€™ father. The identity of Herakleios is uncertain. The approximate times of Apollonius are thus certain, but no exact dates can be given.Studies on the dates of Apollonius are in essence a juggling of the dates of individuals mentioned by Apollonius and other ancient authors. There is the question of exactly what event occurred 246 - 222, whether birth or education. Scholars of the 19th and earlier 20th centuries tend to favor an earlier birth, 260 or 262, in an effort to make Apollonius more the age-mate of Archimedes. Some inscriptional evidence that turned up at Pompeii make Philonides the best dated character. He lived in the 2nd century BC. Since Apollonius' life must be extended into the 2nd century, early birth dates are less likely. A more detailed presentation of the data and problems may be found in BOOK, The Ancient Tradition of Geometric Problems, Wilbur Richard, Knorr, Cambridge, MA, BirkhÃ¤user Boston, 1986, The Successors of Archimedes in the Third Century, The dichotomy between conventional dates deriving from tradition and a more realistic approach is shown by ENCYCLOPEDIA, Apollonius of Perga, A to Z of Mathematicians, McElroy, Tucker, 2005, McElroy at once gives 262 - 190 (high-side dates) and explains that it should be late 3rd - early 2nd as it is in this article. The figure Specific birth and death years stated by the various scholars are only speculative.{{Harvnb|Fried|Unguru|2001|loc=Introduction}}Eutocius appears to associate Perga with the Ptolemaic dynasty of Egypt. Never under Egypt, Perga in 246 BC belonged to the Seleucid Empire, an independent diadochi state ruled by the Seleucid dynasty. During the last half of the 3rd century BC, Perga changed hands a number of times, being alternatively under the Seleucids and under the Kingdom of Pergamon to the north, ruled by the Attalid dynasty. Someone designated â€œof Pergaâ€ might well be expected to have lived and worked there. To the contrary, if Apollonius was later identified with Perga, it was not on the basis of his residence. The remaining autobiographical material implies that he lived, studied and wrote in Alexandria.A letter by the Greek mathematician and astronomer Hypsicles was originally part of the supplement taken from Euclid's Book XIV, part of the thirteen books of Euclid's Elements.WEB, The thirteen books of Euclid's Elements, Thomas Little Heath,weblink 1908,

### The times of Apollonius

Apollonius lived toward the end of a historical period now termed the Hellenistic Period, characterized by the superposition of Hellenic culture over extensive non-Hellenic regions to various depths, radical in some places, hardly at all in others. The change was initiated by Philip II of Macedon and his son, Alexander the Great, who, subjecting all of Greece is a series of stunning victories, went on to conquer the Persian Empire, which ruled territories from Egypt to Pakistan. Philip was assassinated in 336 BC. Alexander went on to fulfill his plan by conquering the vast Persian empire.### The short autobiography of Apollonius

The material is located in the surviving false â€œPrefacesâ€ of the books of his*Conics.*These are letters delivered to influential friends of Apollonius asking them to review the book enclosed with the letter. The Preface to Book I, addressed to one Eudemus, reminds him that

*Conics*was initially requested by a house guest at Alexandria, the geometer, Naucrates, otherwise unknown to history. Naucrates had the first draft of all eight books in his hands by the end of the visit. Apollonius refers to them as being â€œwithout a thorough purgationâ€ (

*ou diakatharantes*in Greek,

*ea non perpurgaremus*in Latin). He intended to verify and emend the books, releasing each one as it was completed.Hearing of this plan from Apollonius himself on a subsequent visit of the latter to Pergamon, Eudemus had insisted Apollonius send him each book before release. The circumstances imply that at this stage Apollonius was a young geometer seeking the company and advice of established professionals. Pappus states that he was with the students of Euclid at Alexandria. Euclid was long gone. This stay had been, perhaps, the final stage of Apolloniusâ€™ education. Eudemus was perhaps a senior figure in his earlier education at Pergamon; in any case, there is reason to believe that he was or became the head of the Library and Research Center (Museum) of Pergamon. Apollonius goes on to state that the first four books were concerned with the development of elements while the last four were concerned with special topics.There is something of a gap between Prefaces I and II. Apollonius has sent his son, also Apollonius, to deliver II. He speaks with more confidence, suggesting that Eudemus use the book in special study groups, which implies that Eudemus was a senior figure, if not the headmaster, in the research center. Research in such institutions, which followed the model of the Lycaeum of Aristotle at Athens, due to the residency of Alexander the Great and his companions in its northern branch, was part of the educational effort, to which the library and museum were adjunct. There was only one such school in the state. Owned by the king, it was under royal patronage, which was typically jealous, enthusiastic, and participatory. The kings bought, begged, borrowed and stole the precious books whenever and wherever they could. Books were of the highest value, affordable only to wealthy patrons. Collecting them was a royal obligation. Pergamon was known for its parchment industry, whence â€œparchmentâ€ is derived from â€œPergamon.â€Apollonius brings to mind Philonides of Laodicea, a geometer whom he introduced to Eudemus in Ephesus. Philonides became Eudemus' student. He lived mainly in Syria during the 1st half of the 2nd century BC. Whether the meeting indicates that Apollonius now lived in Ephesus is unresolved. The intellectual community of the Mediterranean was international in culture. Scholars were mobile in seeking employment. They all communicated via some sort of postal service, public or private. Surviving letters are abundant. They visited each other, read each other's works, made suggestions to each other, recommended students and accumulated a tradition termed by some â€œthe golden age of mathematics.â€Preface III is missing. During the interval Eudemus passed away, says Apollonius in IV, again supporting a view that Eudemus was senior over Apollonius. Prefaces IVâ€“VII are more formal, omitting personal information and concentrating on summarizing the books. They are all addressed to a mysterious Attalus, a choice made â€œbecauseâ€, as Apollonius writes to Attalus, â€œof your earnest desire to possess my works.â€ By that time a good many people at Pergamum had such a desire. Presumably, this Attalus was someone special, receiving copies of Apolloniusâ€™ masterpiece fresh from the author's hand. One strong theory is that Attalus is Attalus II Philadelphus, 220-138 BC, general and defender of his brother's kingdom (Eumenes II), co-regent on the latter's illness in 160 BC, and heir to his throne and his widow in 158 BC. He and his brother were great patrons of the arts, expanding the library into international magnificence. The dates are consonant with those of Philonides, while Apolloniusâ€™ motive is consonant with Attalus' book-collecting initiative.Apollonius sent to Attalus Prefaces Vâ€“VII. In Preface VII he describes Book VIII as â€œan appendixâ€ ... â€œwhich I will take care to send you as speedily as possible.â€ There is no record that it was ever sent or ever completed. It may be missing from history because it was never in history, Apollonius having died before its completion.

## Documented works of Apollonius

Apollonius was a prolific geometer, turning out a large number of works. Only one survives,*Conics*. It is a dense and extensive reference work on the topic, even by today's standards, serving as a repository of now little known geometric propositions as well as a vehicle for some new ones devised by Apollonius. Its audience was not the general population, which could not read or write. It was always intended for savants of mathematics and their small number of educated readers associated with the state schools and their associated libraries. It always was, in other words, a library reference work. Its basic definitions have become an important mathematical heritage. For the most part its methods and conclusions have been superseded by Analytic Geometry.Of its eight books, only the first four have a credible claim to descent from the original texts of Apollonius. Books 5-7 have been translated from the Arabic into Latin. The original Greek has been lost. The status of Book VIII is unknown. A first draft existed. Whether the final draft was ever produced is not known. A "reconstruction" of it by Edmond Halley exists in Latin. There is no way to know how much of it, if any, is verisimilar to Apollonius. Halley also reconstructed

*De Rationis Sectione*and

*De Spatii Sectione*. Beyond these works, except for a handful of fragments, documentation that might in any way be interpreted as descending from Apollonius ends.Many of the lost works are described or mentioned by commentators. In addition are ideas attributed to Apollonius by other authors without documentation. Credible or not, they are hearsay. Some authors identify Apollonius as the author of certain ideas, consequently named after him. Others attempt to express Apollonius in modern notation or phraseology with indeterminate degrees of fidelity.

### *Conics*

The Greek text of *Conics*uses the Euclidean arrangement of definitions, figures and their parts; i.e., the â€œgivens,â€ followed by propositions â€œto be proved.â€ Books I-VII present 387 propositions. This type of arrangement can be seen in any modern geometry textbook of the traditional subject matter. As in any course of mathematics, the material is very dense and consideration of it, necessarily slow. Apollonius had a plan for each book, which is partly described in the

*Prefaces*. The headings, or pointers to the plan, are somewhat in deficit, Apollonius having depended more on the logical flow of the topics.An intellectual niche is thus created for the commentators of the ages. Each must present Apollonius in the most lucid and relevant way for his own times. They use a variety of methods: annotation, extensive prefatory material, different formats, additional drawings, superficial reorganization by the addition of capita, and so on. There are subtle variations in interpretation. The modern English speaker encounters a lack of material in English due to the preference for New Latin by English scholars. Such intellectual English giants as Edmund Halley and Isaac Newton, the proper descendants of the Hellenistic tradition of mathematics and astronomy, can only be read and interpreted in translation by populations of English speakers unacquainted with the classical languages; that is, most of them.Presentations written entirely in native English begin in the late 19th century. Of special note is Heath's

*Treatise on Conic Sections*. His extensive prefatory commentary includes such items as a lexicon of Apollonian geometric terms giving the Greek, the meanings, and usage.{{harvnb|Apollonius of Perga|Heath|1896|pp=clvii-clxx}} Commenting that â€œthe apparently portentious bulk of the treatise has deterred many from attempting to make its acquaintance,â€{{harvnb|Apollonius of Perga||Heath|1896|p=vii}} he promises to add headings, changing the organization superficially, and to clarify the text with modern notation. His work thus references two systems of organization, his own and Apolloniusâ€™, to which concordances are given in parentheses.Heath's work is indispensable. He taught throughout the early 20th century, passing away in 1940, but meanwhile another point of view was developing. St. John's College (Annapolis/Santa Fe), which had been a military school since colonial times, preceding the United States Naval Academy at Annapolis, Maryland, to which it is adjacent, in 1936 lost its accreditation and was on the brink of bankruptcy. In desperation the board summoned Stringfellow Barr and Scott Buchanan from the University of Chicago, where they had been developing a new theoretical program for instruction of the Classics. Leaping at the opportunity, in 1937 they instituted the â€œnew programâ€ at St. John's, later dubbed the Great Books program, a fixed curriculum that would teach the works of select key contributors to the culture of western civilization. At St. John's, Apollonius came to be taught as himself, not as some adjunct to analytic geometry.The â€œtutorâ€ of Apollonius was R. Catesby Taliaferro, a new PhD in 1937 from the University of Virginia. He tutored until 1942 and then later for one year in 1948, supplying the English translations by himself, translating Ptolemy's

*Almagest*and Apolloniusâ€™

*Conics*. These translations became part of the EncyclopÃ¦dia Britannica's Great Books of the Western World series. Only Books I-III are included, with an appendix for special topics. Unlike Heath, Taliaferro did not attempt to reorganize Apollonius, even superficially, or to rewrite him. His translation into modern English follows the Greek fairly closely. He does use modern geometric notation to some degree.Contemporaneously with Taliaferro's work, Ivor Thomas an Oxford don of the World War II era, was taking an intense interest in Greek mathematics. He planned a compendium of selections, which came to fruition during his military service as an officer in the Royal Norfolk Regiment. After the war it found a home in the Loeb Classical Library, where it occupies two volumes, all translated by Thomas, with the Greek on one side of the page and the English on the other, as is customary for the Loeb series. Thomas' work has served as a handbook for the golden age of Greek mathematics. For Apollonius he only includes mainly those portions of Book I that define the sections.Heath, Taliaferro, and Thomas satisfied the public demand for Apollonius in translation for most of the 20th century. The subject moves on. More recent translations and studies incorporate new information and points of view as well as examine the old.

#### Book I

(File:Cono cortes 2.png|thumb|300px|Perspective illustration of one branch of a double cone showing the relevant planes: base, axial plane, of a circle, of an ellipse, of a parabola, of a hyperbola (only half is in this branch), the intersections of the latter two with the base, and the diameters of the sections.)Book I presents 58 propositions. Its most salient content is all the basic definitions concerning cones and conic sections. These definitions are not exactly the same as the modern ones of the same words. Etymologically the modern words derive from the ancient, but the etymon often differs in meaning from its reflex.A conical surface is generated by a line segment rotated about a bisector point such that the end points trace circles, each in its own plane. A cone, one branch of the double conical surface, is the surface with the point (apex or vertex), the circle (base), and the axis, a line joining vertex and center of base.A â€œsectionâ€ (Latin sectio, Greek tome) is an imaginary â€œcuttingâ€ of a cone by a plane.- Proposition I.3: â€œIf a cone is cut by a plane through the vertex, the section is a triangle.â€ In the case of a double cone, the section is two triangles such that the angles at the vertex are vertical angles.
- Proposition I.4 asserts that sections of a cone parallel to the base are circles with centers on the axis.Note that the Greek geometers were not defining the circle, the ellipse, and other figures as conic sections. This would be circular definition, as the cone was defined in terms of a circle. Each figure has its own geometric definition, and in addition, is being shown to be a conic section.
- Proposition I.13 defines the ellipse, which is conceived as the cutting of a single cone by a plane inclined to the plane of the base and intersecting the latter in a line perpendicular to the diameter extended of the base outside the cone (not shown). The angle of the inclined plane must be greater than zero, or the section would be a circle. It must be less than the corresponding base angle of the axial triangle, at which the figure becomes a parabola.
- Proposition I.11 defines a parabola. Its plane is parallel to a side in the conic surface of the axial triangle.
- Proposition I.12 defines a hyperbola. Its plane is parallel to the axis. It cut both cones of the pair, thus acquiring two distinct branches (only one is shown).

{{math|y2 {{=}} kx}}

which is one modern form of the equation for a parabola. The rectangle has sides k and x. It was he who accordingly named the figure, parabola, â€œapplication.â€The â€œno applicabilityâ€ case is further divided into two possibilities. Given a function, f(x), such that, in the applicability case, {{math|y2 {{=}} g(x)}}, in the no applicability case, either {{math|y2 > g(x)}} or {{math|y2 < g(x)}}. In the former, g(x) falls short of y2 by a quantity termed the ellipsis, â€deficit.â€ In the latter, g(x) overshoots by a quantity termed the hyperbole, â€œsurfit.â€Applicability could be achieved by adding the deficit, {{math|y2 {{=}} f(x) {{=}} g(x) + d}}, or subtracting the surfit, g(x) - s. The figure compensating for a deficit was named an ellipse; for a surfit, a hyperbola.Note that a circle, being another case of the deficit, is sometimes considered a kind of ellipse with a single center instead of two foci. The terms of the modern equation depend on the translation and rotation of the figure from the origin, but the general equation for an ellipse,
{{math|Ax2 + By2 {{=}} C}}

can be placed in the formy^2 {{=}} left | frac{{A}}{{B}}x^2right | + frac{{C}}{{B}}where C/B is the d, while an equation for the hyperbola,
{{math|Ax2 - By2 {{=}} C}}

becomesy^2 {{=}} left | frac{{A}}{{B}}x^2right | - frac{{C}}{{B}}where C/B is the s.Note that y2 = g(x) is not the equation for a parabola, which is y2 = kx, the x being a lower power.#### Book II

Book II contains 53 propositions. Apollonius says that he intended to cover "the properties having to do with the diameters and axes and also the asymptotes and other things ... for limits of possibility." His definition of "diameter" is different from the traditional, as he finds it necessary to refer the intended recipient of the letter to his work for a definition. The elements mentioned are those that specify the shape and generation of the figures. Tangents are covered at the end of the book.#### Book III

Book III contains 56 propositions. Apollonius claims original discovery for theorems "of use for the construction of solid loci ... the three-line and four-line locus ...." The locus of a conic section is the section. The three-line locus problem (as stated by Taliafero's appendix to Book III) finds "the locus of points whose distances from three given fixed straight lines ... are such that the square of one of the distances is always in a constant ratio to the rectangle contained by the other two distances." This is the proof of the application of areas resulting in the parabola.{{sfn|Heath|1911|p=187}} The four-line problem results in the ellipse and hyperbola. Analytic geometry derives the same loci from simpler criteria supported by algebra, rather than geometry, for which Descartes was highly praised. He supersedes Apollonius in his methods.#### Book IV

Book IV contains 57 propositions. The first sent to Attalus, rather than to Eudemus, it thus represents his more mature geometric thought. The topic is rather specialized: "the greatest number of points at which sections of a cone can meet one another, or meet a circumference of a circle, ...." Nevertheless, he speaks with enthusiasm, labeling them "of considerable use" in solving problems (Preface 4).Many of the commentators and translators, as well, no doubt, as copyists, have been explicitly less than enthusiastic about their use, especially after analytic geometry, which can do most of the problems by algebra without any stock of constructions. Taliaferro stops at Book III. Heath attempts a digest of the book to make it more palatable to the reader ({{harvnb|Apollonius of Perga|Heath|1896|loc=Intersecting Conics}}) Fried is more true to Apollonius, supplying an extensive critical apparatus instead ({{harvnb|Apollonius of Perga|Fried|2002|loc=Footnotes}}).#### Book V

Book V, known only through translation from the Arabic, contains 77 propositions, the most of any book.{{harvnb|Fried|Unguru|2001|p=146}} They cover the ellipse (50 propositions), the parabola (22), and the hyperbola (28).{{harvnb|Fried|Unguru|2001|p=188}} These are not explicitly the topic, which in Prefaces I and V Apollonius states to be maximum and minimum lines. These terms are not explained. In contrast to Book I, Book V contains no definitions and no explanation.The ambiguity has served as a magnet to exegetes of Apollonius, who must interpret without sure knowledge of the meaning of the book's major terms. Until recently Heath's view prevailed: the lines are to be treated as normals to the sections.{{harvnb|Apollonius of Pergas|Heath|1896|loc=Normals as Maxima and Minima}} A normal in this case is the perpendicular to a curve at a tangent point sometimes called the foot. If a section is plotted according to Apolloniusâ€™ coordinate system (see below under Methods of Apollonius), with the diameter (translated by Heath as the axis) on the x-axis and the vertex at the origin on the left, the phraseology of the propositions indicates that the minima/maxima are to be found between the section and the axis. Heath is led into his view by consideration of a fixed point p on the section serving both as tangent point and as one end of the line. The minimum distance between p and some point g on the axis must then be the normal from p.In modern mathematics, normals to curves are known for being the location of the center of curvature of that small part of the curve located around the foot. The distance from the foot to the center is the radius of curvature. The latter is the radius of a circle, but for other than circular curves, the small arc can be approximated by a circular arc. The curvature of non-circular curves; e.g., the conic sections, must change over the section. A map of the center of curvature; i.e., its locus, as the foot moves over the section, is termed the evolute of the section. Such a figure, the edge of the successive positions of a line, is termed an envelope today. Heath believed that in Book V we are seeing Apollonius establish the logical foundation of a theory of normals, evolutes, and envelopes.{{harvnb|Apollonius of Perga|Heath|1896|loc=Propositions Leading Immediately to the Determination of the Evolute}}Heath's was accepted as the authoritative interpretation of Book V for the entire 20th century, but the changing of the century brought with it a change of view. In 2001, Apollonius scholars Fried & Unguru, granting all due respect to other Heath chapters, balked at the historicity of Heath's analysis of Book V, asserting that he â€œreworks the original to make it more congenial to a modern mathematician ... this is the kind of thing that makes Heathâ€™s work of dubious value for the historian, revealing more of Heathâ€™s mind than that of Apollonius.â€{{harvnb|Fried|Unguru|2001|p=148}} Some of his arguments are in summary as follows. There is no mention of maxima/minima being per se normals in either the prefaces or the books proper.Normalis is a perfectly good Latin word meaning "measured with a norma," or square. Halley uses it to translate Pappus' eutheia, "right-placed," which has a more general sense of directionally right. For "the perpendicular to," the mathematical Greeks used "the normal of," where the object of "of" could be any figure, usually a straight line. What Fried is saying is that there was no standard use of normal to mean normal of a curve, nor did Apollonius introduce one, although in several isolated cases he did describe one. Out of Heath's selection of 50 propositions said to cover normals, only 7, Book V: 27-33, state or imply maximum/minimum lines being perpendicular to the tangents. These 7 Fried classifies as isolated, unrelated to the main propositions of the book. They do not in any way imply that maxima/minima in general are normals. In his extensive investigation of the other 43 propositions, Fried proves that many cannot be.Fried & Unguru dedicate an entire chapter to these criticisms:{{harvnb|Fried|Unguru|2001|loc=Maximum and Minimum Lines: Book V of the Conica}}Fried and Unguru counter by portraying Apollonius as a continuation of the past rather than a foreshadowing of the future. First is a complete philological study of all references to minimum and maximum lines, which uncovers a standard phraseology. There are three groups of 20-25 propositions each.A summary table is given in {{harvnb|Fried|Unguru|2001|p=190}} The first group contains the phrase â€œfrom a point on the axis to the section,â€ which is exactly the opposite of a hypothetical â€œfrom a point on the section to the axis.â€ The former does not have to be normal to anything, although it might be. Given a fixed point on the axis, of all the lines connecting it to all the points of the section, one will be longest (maximum) and one shortest (minimum). Other phrases are â€œin a section,â€ â€œdrawn from a section,â€ â€œcut off between the section and its axis,â€ cut off by the axis,â€ all referring to the same image.In the view of Fried and Unguru, the topic of Book V is exactly what Apollonius says it is, maximum and minimum lines. These are not code words for future concepts, but refer to ancient concepts then in use. The authors cite Euclid, Elements, Book III, which concerns itself with circles, and maximum and minimum distances from interior points to the circumference.{{harvnb|Fried|Unguru|2001|p=182}} Without admitting to any specific generality they use terms such as â€œlikeâ€ or â€œthe analog of.â€ They are known for innovating the term â€œneusis-like.â€ A neusis construction was a method of fitting a given segment between two given curves. Given a point P, and a ruler with the segment marked off on it. one rotates the ruler around P cutting the two curves until the segment is fitted between them. In Book V, P is the point on the axis. Rotating a ruler around it, one discovers the distances to the section, from which the minimum and maximum can be discerned. The technique is not applied to the situation, so it is not neusis. The authors use neusis-like, seeing an archetypal similarity to the ancient method.#### Book VI

Book VI, known only through translation from the Arabic, contains 33 propositions, the least of any book. It also has large lacunae, or gaps in the text, due to damage or corruption in the previous texts.The topic is relatively clear and uncontroversial. Preface 1 states that it is â€œequal and similar sections of cones.â€ Apollonius extends the concepts of congruence and similarity presented by Euclid for more elementary figures, such as triangles, quadrilaterals, to conic sections. Preface 6 mentions â€œsections and segmentsâ€ that are â€œequal and unequalâ€ as well as â€œsimilar and dissimilar,â€ and adds some constructional information.Book VI features a return to the basic definitions at the front of the book. â€œEqualityâ€ is determined by an application of areas. If one figure; that is, a section or a segment, is â€œappliedâ€ to another (Halley's*si applicari possit altera super alteram*), they are â€œequalâ€ (Halley's

*aequales*) if they coincide and no line of one crosses any line of the other. This is obviously a standard of congruence following Euclid, Book I, Common Notions, 4: â€œand things coinciding (

*epharmazanta*) with one another are equal (

*isa*).â€ Coincidence and equality overlap, but they are not the same: the application of areas used to define the sections depends on quantitative equality of areas but they can belong to different figures.Between instances that are the same (homos), being equal to each other, and those that are different, or unequal, are figures that are â€œsame-ishâ€ (hom-oios), or similar. They are neither entirely the same nor different, but share aspects that are the same and do not share aspects that are different. Intuitively the geometricians had scale in mind; e.g., a map is similar to a topographic region. Thus figures could have larger or smaller versions of themselves.The aspects that are the same in similar figures depend on the figure. Book 6 of Euclid's Elements presents similar triangles as those that have the same corresponding angles. A triangle can thus have miniatures as small as you please, or giant versions, and still be â€œthe sameâ€ triangle as the original.In Apollonius' definitions at the beginning of Book VI, similar right cones have similar axial triangles. Similar sections and segments of sections are first of all in similar cones. In addition, for every abscissa of one must exist an abscissa in the other at the desired scale. Finally, abscissa and ordinate of one must be matched by coordinates of the same ratio of ordinate to abscissa as the other. The total effect is as though the section or segment were moved up and down the cone to achieve a different scale.A mathematical explanation as well as precis of each proposition in the book can be found in {{harvnb|Toomer|1990|pp=lxi-lxix}} Note that translations of the definitions vary widely as each English author attempts to paraphrase the complexities in clear and succinct English. In essence, no such English is available.

#### Book VII

Book VII, also a translation from the Arabic, contains 51 Propositions. These are the last that Heath considers in his 1896 edition. In Preface I, Apollonius does not mention them, implying that, at the time of the first draft, they may not have existed in sufficiently coherent form to describe. Apollonius uses obscure language, that they are â€œperi dioristikon theorematonâ€, which Halley translated as â€œde theorematis ad determinationem pertinentibus,â€ and Heath as â€œtheorems involving determinations of limits.â€ This is the language of definition, but no definitions are forthcoming. Whether the reference might be to a specific kind of definition is a consideration but to date nothing credible has been proposed.A summary of the question can be found at {{harvnb|Heath|1896|p=lxx}}. Most writers have something to say about it; for example, BOOK, GJ, Toomer, 1990, Apollonius Conics Book V to VII: the Arabic Translation of the Lost Greek Original in the Version of the Banu Musa, I, Sources in the History of Mathematics and Physical Sciences 9, New York, Springer, lxix-lxx, we may regard the establishment of limits of solution as its main purpose, Toomerâ€™s view is given without specifics or reference to any text of Book VII except the Preface. The topic of Book VII, completed toward the end of Apolloniusâ€™ life and career, is stated in Preface VII to be diameters and â€œthe figures described upon them,â€ which must include conjugate diameters, as he relies heavily on them. In what way the term â€œlimitsâ€ or â€œdeterminationsâ€ might apply is not mentioned.Diameters and their conjugates are defined in Book I (Definitions 4-6). Not every diameter has a conjugate. The topography of a diameter (Greek diametros) requires a regular curved figure. Irregularly-shaped areas, addressed in modern times, are not in the ancient game plan. Apollonius has in mind, of course, the conic sections, which he describes in often convolute language: â€œa curve in the same planeâ€ is a circle, ellipse or parabola, while â€œtwo curves in the same planeâ€ is a hyperbola. A chord is a straight line whose two end points are on the figure; i.e., it cuts the figure in two places. If a grid of parallel chords is imposed on the figure, then the diameter is defined as the line bisecting all the chords, reaching the curve itself at a point called the vertex. There is no requirement for a closed figure; e.g., a parabola has a diameter.A parabola has symmetry in one dimension. If you imagine it folded on its one diameter, the two halves are congruent, or fit over each other. The same may be said of one branch of a hyperbola. Conjugate diameters (Greek suzugeis diametroi, where suzugeis is â€œyoked togetherâ€), however, are symmetric in two dimensions. The figures to which they apply require also an areal center (Greek kentron), today called a centroid, serving as a center of symmetry in two directions. These figures are the circle, ellipse, and two-branched hyperbola. There is only one centroid, which must not be confused with the foci. A diameter is a chord passing through the centroid, which always bisects it.For the circle and ellipse, let a grid of parallel chords be superimposed over the figure such that the longest is a diameter and the others are successively shorter until the last is not a chord, but is a tangent point. The tangent must be parallel to the diameter. A conjugate diameter bisects the chords, being placed between the centroid and the tangent point. Moreover, both diameters are conjugate to each other, being called a conjugate pair. It is obvious that any conjugate pair of a circle are perpendicular to each other, but in an ellipse, only the major and minor axes are, the elongation destroying the perpendicularity in all other cases.Conjugates are defined for the two branches of a hyperbola resulting from the cutting of a double cone by a single plane. They are called conjugate branches. They have the same diameter. Its centroid bisects the segment between vertices. There is room for one more diameter-like line: let a grid of lines parallel to the diameter cut both branches of the hyperbola. These lines are chord-like except that they do not terminate on the same continuous curve. A conjugate diameter can be drawn from the centroid to bisect the chord-like lines.These concepts mainly from Book I get us started on the 51 propositions of Book VII defining in detail the relationships between sections, diameters, and conjugate diameters. As with some of Apollonius other specialized topics, their utility today compared to Analytic Geometry remains to be seen, although he affirms in Preface VII that they are both useful and innovative; i.e., he takes the credit for them.### Lost and reconstructed works described by Pappus

Pappus mentions other treatises of Apollonius:- Î›ÏŒÎ³Î¿Ï… á¼€Ï€Î¿Ï„Î¿Î¼Î®,
*De Rationis Sectione*("Cutting of a Ratio") - Î§Ï‰ÏÎ¯Î¿Ï… á¼€Ï€Î¿Ï„Î¿Î¼Î®,
*De Spatii Sectione*("Cutting of an Area") - Î”Î¹Ï‰ÏÎ¹ÏƒÎ¼ÎÎ½Î· Ï„Î¿Î¼Î®,
*De Sectione Determinata*("Determinate Section") - á¼˜Ï€Î±Ï†Î±Î¯,
*De Tactionibus*("Tangencies")JOURNAL, Mackenzie, Dana, A Tisket, a Tasket, an Apollonian Gasket,weblink American Scientist, 98, Januaryâ€“February 2010, 1, 10â€“14, - ÎÎµÏÏƒÎµÎ¹Ï‚,
*De Inclinationibus*("Inclinations") - Î¤ÏŒÏ€Î¿Î¹ á¼Ï€Î¯Ï€ÎµÎ´Î¿Î¹,
*De Locis Planis*("Plane Loci").

*Data*, the

*Porisms*, and

*Surface-Loci*of Euclid and the

*Conics*of Apolloniusâ€”were, according to Pappus, included in the body of the ancient analysis.{{sfn|Heath|1911|p=187}} Descriptions follow of the six works mentioned above.

#### *De Rationis Sectione*

*De Rationis Sectione*sought to resolve a simple problem: Given two straight lines and a point in each, draw through a third given point a straight line cutting the two fixed lines such that the parts intercepted between the given points in them and the points of intersection with this third line may have a given ratio.{{sfn|Heath|1911|p=187}}

#### *De Spatii Sectione*

*De Spatii Sectione*discussed a similar problem requiring the rectangle contained by the two intercepts to be equal to a given rectangle.{{sfn|Heath|1911|p=187}}In the late 17th century, Edward Bernard discovered a version of

*De Rationis Sectione*in the Bodleian Library. Although he began a translation, it was Halley who finished it and included it in a 1706 volume with his restoration of

*De Spatii Sectione*.

#### *De Sectione Determinata*

*De Sectione Determinata*deals with problems in a manner that may be called an analytic geometry of one dimension; with the question of finding points on a line that were in a ratio to the others.BOOK, Carl B., Boyer, Carl Benjamin Boyer, A History of Mathematics, Second, John Wiley & Sons, Inc., 1991, 0-471-54397-7, Apollonius of Perga, 142, The Apollonian treatise

*On Determinate Section*dealt with what might be called an analytic geometry of one dimension. It considered the following general problem, using the typical Greek algebraic analysis in geometric form: Given four points A, B, C, D on a straight line, determine a fifth point P on it such that the rectangle on AP and CP is in a given ratio to the rectangle on BP and DP. Here, too, the problem reduces easily to the solution of a quadratic; and, as in other cases, Apollonius treated the question exhaustively, including the limits of possibility and the number of solutions., The specific problems are: Given two, three or four points on a straight line, find another point on it such that its distances from the given points satisfy the condition that the square on one or the rectangle contained by two has a given ratio either (1) to the square on the remaining one or the rectangle contained by the remaining two or (2) to the rectangle contained by the remaining one and another given straight line. Several have tried to restore the text to discover Apollonius's solution, among them Snellius (Willebrord Snell, Leiden, 1698); Alexander Anderson of Aberdeen, in the supplement to his

*Apollonius Redivivus*(Paris, 1612); and Robert Simson in his

*Opera quaedam reliqua*(Glasgow, 1776), by far the best attempt.{{sfn|Heath|1911|p=187}}

#### *De Tactionibus*

*For more information, see Problem of Apollonius.*

*De Tactionibus*embraced the following general problem: Given three things (points, straight lines, or circles) in position, describe a circle passing through the given points and touching the given straight lines or circles. The most difficult and historically interesting case arises when the three given things are circles. In the 16th century, Vieta presented this problem (sometimes known as the Apollonian Problem) to Adrianus Romanus, who solved it with a hyperbola. Vieta thereupon proposed a simpler solution, eventually leading him to restore the whole of Apollonius's treatise in the small work

*Apollonius Gallus*(Paris, 1600). The history of the problem is explored in fascinating detail in the preface to J. W. Camerer's brief

*Apollonii Pergaei quae supersunt, ac maxime Lemmata Pappi in hos Libras, cum Observationibus, &c*(Gothae, 1795, 8vo).{{sfn|Heath|1911|p=187}}

#### *De Inclinationibus*

The object of *De Inclinationibus*was to demonstrate how a straight line of a given length, tending towards a given point, could be inserted between two given (straight or circular) lines. Though Marin GetaldiÄ‡ and Hugo d'Omerique (

*Geometrical Analysis*, Cadiz, 1698) attempted restorations, the best is by Samuel Horsley (1770).{{sfn|Heath|1911|p=187}}

#### *De Locis Planis*

*De Locis Planis*is a collection of propositions relating to loci that are either straight lines or circles. Since Pappus gives somewhat full particulars of its propositions, this text has also seen efforts to restore it, not only by P. Fermat (

*Oeuvres*, i., 1891, pp. 3â€“51) and F. Schooten (Leiden, 1656) but also, most successfully of all, by R. Simson (Glasgow, 1749).{{sfn|Heath|1911|p=187}}

### Lost works mentioned by other ancient writers

Ancient writers refer to other works of Apollonius that are no longer extant:- Î ÎµÏá½¶ Ï„Î¿á¿¦ Ï€Ï…ÏÎ¯Î¿Ï…,
*On the Burning-Glass*, a treatise probably exploring the focal properties of the parabola - Î ÎµÏá½¶ Ï„Î¿á¿¦ ÎºÎ¿Ï‡Î»Î¯Î¿Ï…,
*On the Cylindrical Helix*(mentioned by Proclus) - A comparison of the dodecahedron and the icosahedron inscribed in the same sphere
- á¼© ÎºÎ±Î¸ÏŒÎ»Î¿Ï… Ï€ÏÎ±Î³Î¼Î±Ï„ÎµÎ¯Î±, a work on the general principles of mathematics that perhaps included Apollonius's criticisms and suggestions for the improvement of Euclid's
*Elements* - á½¨ÎºÏ…Ï„ÏŒÎºÎ¹Î¿Î½ ("Quick Bringing-to-birth"), in which, according to Eutocius, Apollonius demonstrated how to find closer limits for the value of {{pi}} than those of Archimedes, who calculated {{frac|3|1|7}} as the upper limit and {{frac|3|10|71}} as the lower limit
- an arithmetical work (see Pappus) on a system both for expressing large numbers in language more everyday than that of Archimedes'
*The Sand Reckoner*and for multiplying these large numbers - a great extension of the theory of irrationals expounded in Euclid, Book x., from binomial to multinomial and from
*ordered*to*unordered*irrationals (see extracts from Pappus' comm. on Eucl. x., preserved in Arabic and published by Woepke, 1856).{{sfn|Heath|1911|p=187}}

### Early printed editions

(File:Conica of Apollonius of Perga fol. 162b and 164a.jpg|thumbnail|right|Pages from the 9th century Arabic translation of the*Conics*)The early printed editions began for the most part in the 16th century. At that time, scholarly books were expected to be in Latin, today's New Latin. As almost no manuscripts were in Latin, the editors of the early printed works translated from the Greek or Arabic to Latin. The Greek and Latin were typically juxtaposed, but only the Greek is original, or else was restored by the editor to what he thought was original. Critical apparatuses were in Latin. The ancient commentaries, however, were in ancient or medieval Greek. Only in the 18th and 19th centuries did modern languages begin to appear. A representative list of early printed editions is given below. The originals of these printings are rare and expensive. For modern editions in modern languages see the references.

- BOOK, Apollonius, Pergaeus, 1566, Conicorum libri quattuor: una cum Pappi Alexandrini lemmatibus, et commentariis Eutocii Ascalonitae. Sereni Antinensis philosophi libri duo ... quae omnia nuper Federicus Commandinus Vrbinas mendis quampluris expurgata e Graeco conuertit, & commentariis illustrauit, Bononiae, Ex officina Alexandri Benatii, Ancient Greek, Neo-Latin, A presentation of the first four books of
*Conics*in Greek by Fredericus Commandinus with his own translation into Latin and the commentaries of Pappus of Alexandria, Eutocius of Ascalon and Serenus of Antinouplis. - BOOK, Apollonius, Barrow, I, Isaac Barrow, 1675, Apollonii conica: methodo nova illustrata, & succinctÃ¨ demonstrata, Londini, Excudebat Guil. Godbid, voeneunt apud Robertum Scott, in vico Little Britain, Latin,weblink Translation by Barrow from ancient Greek to Neo-Latin of the first four books of
*Conics*. The copy linked here, located in the Boston Public Library, once belonged to John Adams. - BOOK, Apollonius, Pappus, Halley, E., Pappus of Alexandria, Edmond Halley, 1706, Apollonii Pergaei de sectione rationis libri duo: Ex Arabico ms. Latine versi. Accedunt ejusdem de sectione spatii libri duo restituti, Oxonii,weblink Latin, A presentation of two lost but reconstructed works of Apollonius.
*De Sectione Rationis*comes from an unpublished manuscript in Arabic in the Bodleian Library at Oxford originally partially translated by Edward Bernard but interrupted by his death. It was given to Edmond Halley, professor, astronomer, mathematician and explorer, after whom Halley's Comet later was named. Unable to decipher the corrupted text, he abandoned it. Subsequently, David Gregory (mathematician) restored the Arabic for Henry Aldrich, who gave it again to Halley. Learning Arabic, Halley created*De Sectione Rationis*and as an added emolument for the reader created a Neo-Latin translation of a version of*De Sectione Spatii*reconstructed from Pappus Commentary on it. The two Neo-Latin works and Pappus' ancient Greek commentary were bound together in the single volume of 1706. The author of the Arabic manuscript is not known. Based on a statement that it was written under the "auspices" of Al-Ma'mun, Latin Almamon, astronomer and Caliph of Baghdad in 825, Halley dates it to 820 in his "Praefatio ad Lectorem." - BOOK, Apollonius, Alexandrinus Pappus, Halley, Edmond, Eutocius, Serenus, Pappus of Alexandria, Edmond Halley, Eutocius of Ascalon, Serenus of Antinouplis, 1710, Apollonii Pergaei Conicorum libri octo, et Sereni Antissensis De sectione cylindri & coni libri duo, Oxoniae, e Theatro Sheldoniano,weblink Neo-Latin, Ancient Greek, Encouraged by the success of his translation of David Gregory's emended Arabic text of
*de Sectione rationis*, published in 1706, Halley went on to restore and translate into Latin Apolloniusâ€™ entire*elementa conica*.He said in his*Praefatio*of 1710, that although Apollonius was second only (in his opinion) to Archimedes, a large part of his*elementa conica*was â€œtruncatedâ€ and the remaining part â€œless faithful;â€ consequently he was now going to emend it. The question of exactly what items are to be regarded as â€œfaithfulâ€ pervades today's literature. Books I-IV had never been lost. They appear with the Greek in one column and Halley's Latin in a parallel column. Books V-VI came from a windfall discovery of a previously unappreciated translation from Greek to Arabic that had been purchased by the antiquarian scholar Jacobus Golius in Aleppo in 1626. On his death in 1696 it passed by a chain of purchases and bequests to the Bodleian Library (originally as MS Marsh 607, dated 1070).For a more precise version of the chain see WEB, Colin, Wakefield, Arabic Manuscripts in the Bodleian Library,weblink 136â€“137, The translation, dated much earlier, comes from the branch of Almamon's school entitled the BanÅ« MÅ«sÄ, â€œsons of Musa,â€ a group of three brothers, who lived in the 9th century. The translation was performed by writers working for them. In Halley's work, only the Latin translation of Books V-VII is given. This is its first printed publication. Book VIII was lost before the scholars of Almamon could take a hand at preserving it. Halley's concoction, based on expectations developed in Book VII, and the lemmas of Pappus, is given in Latin. The commentaries of Pappus, Serenus and Eutocius are included as a guide to the interpretation of the*Conics*.

## Ideas attributed to Apollonius by other writers

### Apollonius' contribution to astronomy

The equivalence of two descriptions of planet motions, one using excentrics and another deferent and epicycles, is attributed to him. Ptolemy describes this equivalence as Apollonius' theorem in the*Almagest*XII.1.

### Methods of Apollonius

According to Heath,{{harvnb|Apollonius of Perga|Heath|1896|p=ci}} â€œThe Methods of Apolloniusâ€ were not his and were not personal. Whatever influence he had on later theorists was that of geometry, not of his own innovation of technique. Heath says, â€œAs a preliminary to the consideration in detail of the methods employed in the Conics, it may be stated generally that they follow steadily the accepted principles of geometrical investigation which found their definitive expression in the Elements of Euclid.â€With regard to moderns speaking of golden age geometers, the term "method" means specifically the visual, reconstructive way in which the geometer unknowingly produces the same result as an algebraic method used today. As a simple example, algebra finds the area of a square by squaring its side. The geometric method of accomplishing the same result is to construct a visual square. Geometric methods in the golden age could produce most of the results of elementary algebra.#### Geometrical algebra

(File:ÐŸÐ¸Ñ„Ð°Ð³Ð¾Ñ€Ð¾Ð²Ñ‹ ÑˆÑ‚Ð°Ð½Ñ‹.png|thumb|200px|left|Visual form of the Pythagorean theorem as the ancient Greeks saw it. The blue square is the sum of the other two squares.)Heath goes on to use the term geometrical algebra for the methods of the entire golden age. The term is â€œnot inappropriatelyâ€ called that, he says. Today the term has been resurrected for use in other senses (see under geometric algebra). Heath was using it as it had been defined by Henry Burchard Fine in 1890 or before.BOOK, Fine, Henry B, Henry Burchard Fine, 1902, The number-system of algebra treated theoretically and historically, Boston, Leach, 119â€“120, Fine applies it to La GÃ©omÃ©trie of RenÃ© Descartes, the first full-blown work of analytic geometry. Establishing as a precondition that â€œtwo algebras are formally identical whose fundamental operations are formally the same,â€ Fine says that Descartesâ€™ work â€œis not ... mere numerical algebra, but what may for want of a better name be called the algebra of line segments. Its symbolism is the same as that of numerical algebra; ....â€For example, in Apollonius a line segment AB (the line between Point A and Point B) is also the numerical length of the segment. It can have any length. AB therefore becomes the same as an algebraic variable, such as x (the unknown), to which any value might be assigned; e.g., x=3.Variables are defined in Apollonius by such word statements as â€œlet AB be the distance from any point on the section to the diameter,â€ a practice that continues in algebra today. Every student of basic algebra must learn to convert â€œword problemsâ€ to algebraic variables and equations, to which the rules of algebra apply in solving for x. Apollonius had no such rules. His solutions are geometric.Relationships not readily amenable to pictorial solutions were beyond his grasp; however, his repertory of pictorial solutions came from a pool of complex geometric solutions generally not known (or required) today. One well-known exception is the indispensable Pythagorean Theorem, even now represented by a right triangle with squares on its sides illustrating an expression such as a2 + b2 = c2. The Greek geometers called those terms â€œthe square on AB,â€ etc. Similarly, the area of a rectangle formed by AB and CD was "the rectangle on AB and CD."These concepts gave the Greek geometers algebraic access to linear functions and quadratic functions, which latter the conic sections are. They contain powers of 1 or 2 respectively. Apollonius had not much use for cubes (featured in solid geometry), even though a cone is a solid. His interest was in conic sections, which are plane figures. Powers of 4 and up were beyond visualization, requiring a degree of abstraction not available in geometry, but ready at hand in algebra.#### The coordinate system of Apollonius

(File:Cartesian-coordinate-system Oxy P.svg|thumb|200px|Cartesian coordinate system, standard in analytic geometry)All ordinary measurement of length in public units, such as inches, using standard public devices, such as a ruler, implies public recognition of a Cartesian grid; that is, a surface divided into unit squares, such as one square inch, and a space divided into unit cubes, such as one cubic inch. The ancient Greek units of measurement had provided such a grid to Greek mathematicians since the Bronze Age. Prior to Apollonius, Menaechmus and Archimedes had already started locating their figures on an implied window of the common grid by referring to distances conceived to be measured from a left-hand vertical line marking a low measure and a bottom horizontal line marking a low measure, the directions being rectilinear, or perpendicular to one another.{{harvnb|Apollonius of Perga|Heath|1896|p=cxv}} These edges of the window become, in the Cartesian coordinate system, the axes. One specifies the rectilinear distances of any point from the axes as the coordinates. The ancient Greeks did not have that convention. They simply referred to distances.Apollonius does have a standard window in which he places his figures. Vertical measurement is from a horizontal line he calls the â€œdiameter.â€ The word is the same in Greek as it is in English, but the Greek is somewhat wider in its comprehension.Apollonius,*Conics*, Book I, Definition 4. Refer also to {{harvnb|Apollonius of Perga|Heath|1896|p=clxi}} If the figure of the conic section is cut by a grid of parallel lines, the diameter bisects all the line segments included between the branches of the figure. It must pass through the vertex (koruphe, "crown"). A diameter thus comprises open figures such as a parabola as well as closed, such as a circle. There is no specification that the diameter must be perpendicular to the parallel lines, but Apollonius uses only rectilinear ones.The rectilinear distance from a point on the section to the diameter is termed tetagmenos in Greek, etymologically simply â€œextended.â€ As it is only ever extended â€œdownâ€ (kata-) or â€œupâ€ (ana-), the translators interpret it as ordinate. In that case the diameter becomes the x-axis and the vertex the origin. The y-axis then becomes a tangent to the curve at the vertex. The abscissa is then defined as the segment of the diameter between the ordinate and the vertex.Using his version of a coordinate system, Apollonius manages to develop in pictorial form the geometric equivalents of the equations for the conic sections, which raises the question of whether his coordinate system can be considered Cartesian. There are some differences. The Cartesian system is to be regarded as universal, covering all figures in all space applied before any calculation is done. It has four quadrants divided by the two crossed axes. Three of the quadrants include negative coordinates meaning directions opposite the reference axes of zero.Apollonius has no negative numbers, does not explicitly have a number for zero, and does not develop the coordinate system independently of the conic sections. He works essentially only in Quadrant 1, all positive coordinates. Carl Boyer, a modern historian of mathematics, therefore says:BOOK, Carl B., Boyer, Carl Benjamin Boyer, A History of Mathematics, Second, John Wiley & Sons, Inc., 1991, 0-471-54397-7, Apollonius of Perga, 156â€“157, â€However, Greek geometric algebra did not provide for negative magnitudes; moreover, the coordinate system was in every case superimposed

*a posteriori*upon a given curve in order to study its properties .... Apollonius, the greatest geometer of antiquity, failed to develop analytic geometry....â€™â€™No one denies, however, that Apollonius occupies some sort of intermediate niche between the grid system of conventional measurement and the fully developed Cartesian Coordinate System of Analytic Geometry. In reading Apollonius, one must take care not to assume modern meanings for his terms.

#### The theory of proportions

Apollonius uses the "Theory of Proportions" as expressed in Euclidâ€™s*Elements*, Books 5 and 6. Devised by Eudoxus of Cnidus, the theory is intermediate between purely graphic methods and modern number theory. A standard decimal number system is lacking, as is a standard treatment of fractions. The propositions, however, express in words rules for manipulating fractions in arithmetic. Heath proposes that they stand in place of multiplication and division.{{harvnb|Apollonius of Perga|Heath|1896|pp=ci â€“ cii}}By the term â€œmagnitudeâ€ Eudoxus hoped to go beyond numbers to a general sense of size, a meaning it still retains. With regard to the figures of Euclid, it most often means numbers, which was the Pythagorean approach. Pythagoras believed the universe could be characterized by quantities, which belief has become the current scientific dogma. Book V of Euclid begins by insisting that a magnitude (megethos, â€œsizeâ€) must be divisible evenly into units (meros, â€œpartâ€). A magnitude is thus a multiple of units. They do not have to be standard measurement units, such as meters or feet. One unit can be any designated line segment.There follows perhaps the most useful fundamental definition ever devised in science: the ratio (Greek logos, meaning roughly â€œexplanation.â€) is a statement of relative magnitude. Given two magnitudes, say of segments AB and CD. the ratio of AB to CD, where CD is considered unit, is the number of CD in AB; for example, 3 parts of 4, or 60 parts per million, where ppm still uses the â€œpartsâ€ terminology. The ratio is the basis of the modern fraction, which also still means â€œpart,â€ or â€œfragmentâ€, from the same Latin root as fracture.The ratio is the basis of mathematical prediction in the logical structure called a â€œproportionâ€ (Greek analogos). The proportion states that if two segments, AB and CD, have the same ratio as two others, EF and GH, then AB and CD are proportional to EF and GH, or, as would be said in Euclid, AB is to CD as EF is to GH.Algebra reduces this general concept to the expression AB/CD = EF/GH. Given any three of the terms, one can calculate the fourth as an unknown. Rearranging the above equation, one obtains AB = (CD/GH)â€¢EF, in which, expressed as y = kx, the CD/GH is known as the â€œconstant of proportionality.â€ The Greeks had little difficulty with taking multiples (Greek pollaplasiein), probably by successive addition.Apollonius uses ratios almost exclusively of line segments and areas, which are designated by squares and rectangles. The translators have undertaken to use the colon notation introduced by Gottfried Wilhelm Leibniz in

*Acta Eruditorum*, 1684.BOOK, A history of mathematical notations, Florian, Cajori, New York, Dover Publications, 1993, 295, Here is an example from

*Conics*, Book I, on Proposition 11:

Literal translation of the Greek: Let it be contrived that the (square) of BC be to the (rectangle) of BAC as FH is to FA
Taliaferroâ€™s translation: â€œLet it be contrived that sq. BC : rect. BA.AC :: FH : FAâ€
Algebraic equivalent: BC2/BAâ€¢BC = FH/FA

## Honors accorded by history

The crater Apollonius on the Moon is named in his honor.## See also

{{Div col}}- Apollonian circles
- Apollonian gasket
- Apollonian network
- Circles of Apollonius
- Descartes' theorem
- Problem of Apollonius
- Apollonius' theorem

## Notes

{{reflist}}## References

- BOOK, Alhazen, Hogendijk, JP, Ibn al-Haytham, Jan Hogendijk, Ibn al-Haytham's Completion of the "Conics", New York, Springer Verlag, 1985, English,
- BOOK, Apollonius of Perga, Halley, Edmund, Edmund Halley, Balsam, Paul Heinrich, 1861, Des Apollonius von Perga sieben BÃ¼cher Ã¼ber Kegelschnitte Nebst dem durch Halley wieder hergestellten achten Buche; dabei ein Anhang, enthaltend Die auf die Geometrie der Kegelschnitte bezÃ¼glichen SÃ¤tze aus Newton's "Philosophiae naturalis principia mathematica.", German, Berlin, De Gruyter,
- {{EB1911|wstitle=Apollonius of Perga |volume=2 |pages=186â€“188|first=Thomas Little |last=Heath |authorlink=Thomas Little Heath}}
- BOOK, Apollonius of Perga, Halley, Edmund, Edmund Halley, Fried, Michael N, 2011, Edmond Halley's reconstruction of the lost book of Apollonius's Conics: translation and commentary, New York, Springer, Sources and studies in the history of mathematics and physical sciences, 1461401453,
- BOOK, harv, Apollonius of Perga, Thomas Little, Heath, Thomas Little Heath, 1896, Treatise on conic sections, Cambridge, University Press,weblink
- BOOK, Apollonius of Perga, Heiberg, JL, Johan Ludvig Heiberg (historian), Apollonii Pergaei quae Graece exstant cum commentariis antiquis, Volume I, Leipzig, Teubner, 1891, Ancient Greek, Neo-Latin,weblink
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## External links

{{commons category multi|Apollonius of Perga|Cone (geometry)}}Many of the popular sites in the history of mathematics linked below reference or analyze concepts attributed to Apollonius in modern notations and concepts. Since much of Apollonius is subject to interpretation, and he does not per se use modern vocabulary or concepts, the analyses below may not be optimal or accurate. They represent the historical theories of their authors.- WEB,weblink Apollonius of Perga, The Editors of EncyclopÃ¦dia Britannica, 2006, Encyclopaedia Britannica,
- WEB,weblink Conics of Apollonius, Kunkel, Paul, 2016, Whistler Alley Mathematics, whistleralley.com, 15 February 2017,
- {{MacTutor Biography|id=Apollonius}}
- WEB, Mathematics and Mathematical Astronomy,weblink Brown University,
- WEB, Apollonii Pergaei Conicorum,weblink Linda Hall Library Digital Collection,
- WEB, Apollonius and Conic Sections, 2009, David Dennis, Susan Addington, Mathematical Intentions, quadrivium.info,weblink
- WEB, Can You Really Derive Conic Formulae from a Cone?, Gary S., Stoudt, Mathematical Association of America, March 28, 2017,weblink
- THESIS, Ph.D., McKinney, Colin Bryan Powell, 2010, Conjugate diameters: Apollonius of Perga and Eutocius of Ascalon, University of Iowa,weblink

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