SUPPORT THE WORK

GetWiki

psi (letter)

ARTICLE SUBJECTS
aesthetics  →
being  →
complexity  →
database  →
enterprise  →
ethics  →
fiction  →
history  →
internet  →
knowledge  →
language  →
licensing  →
linux  →
logic  →
method  →
news  →
perception  →
philosophy  →
policy  →
purpose  →
religion  →
science  →
sociology  →
software  →
truth  →
unix  →
wiki  →
ARTICLE TYPES
essay  →
feed  →
help  →
system  →
wiki  →
ARTICLE ORIGINS
critical  →
discussion  →
forked  →
imported  →
original  →
psi (letter)
[ temporary import ]
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
{{about|the Greek letter|the Cyrillic letter|Psi (Cyrillic)}}{{pp-semi-indef}}{{Refimprove|date=May 2013}}{{Greek Alphabet|letter=psi|image=Greek alphabet psi.svg}}File:NAMA Alphabet grec.jpg|thumb|The Greek alphabet on a black-figure potteryblack-figure potteryPsi ({{IPAc-en|(|p|)|s|aɪ}}; uppercase ', lowercase '; psi {{IPA-el|ˈpsi|}}) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word "lapse").For Greek loanwords in Latin and modern languages with Latin alphabets, psi is usually transliterated as "ps".The letter's origin is uncertain. It may or may not derive from the Phoenician alphabet. It appears in the 7th century BC, expressing /ps/ in the Eastern alphabets, but /kʰ/ in the Western alphabets (the sound expressed by Χ in the Eastern alphabets). In writing, the early letter appears in an angular shape ((File:Greek Psi straight.svg|15px|)).There were early graphical variants that omitted the stem ("chickenfoot-shaped psi" as: (File:Greek Psi V-shaped.svg|15px) or (File:Greek Chi 05.svg|15px)).The Western letter (expressing /kʰ/, later /x/) was adopted into the Old Italic alphabets, and its shape is also continued into the Algiz rune of the Elder Futhark. The classical Greek letter was adopted into the early Cyrillic alphabet as "Ѱ".

Use as a symbol

The letter psi is commonly used in physics to represent wave functions in quantum mechanics, such as in the Schrödinger equation and bra–ket notation: langlephi|psirangle. It is also used to represent the (generalized) positional states of a qubit in a quantum computer.Psi is also used as the symbol for the polygamma function, defined by
psi^{(m)}(z) = frac{d^m}{dz^m} frac{Gamma' (z)}{Gamma (z)}
where Gamma (z) is the gamma function.The letters Ψ or ψ can also be a symbol for:

Character encodings

  • Greek / Coptic Psi
{{charmap
name1=Greek Capital Letter Psiname2=Greek Small Letter Psiname3=Greek Letter Small Capital Psiname4=Coptic Capital Letter Psiname5=Coptic Small Letter Psimap2char1=96|map2char2=AFmap3char1=D4|map3char2=F6map4char1=D8|map4char2=F8TeX>ref1char1=Psi|ref1char2=psi}}Unicode Code Charts: Greek and Coptic (Range: 0370-03FF)
  • Cyrillic Psi
{{charmap
name1=Cyrillic Capital Letter Psiname2=Cyrillic Small Letter Psi}}
  • Mathematical Psi
{{charmap
name1=Mathematical BoldCapital Psiname2=Mathematical BoldSmall Psiname3=Mathematical ItalicCapital Psiname4=Mathematical ItalicSmall Psiname5=Mathematical Bold ItalicCapital Psiname6=Mathematical Bold ItalicSmall Psi}}{{charmapname1=Mathematical Sans-SerifBold Capital Psiname2=Mathematical Sans-SerifBold Small Psiname3=Mathematical Sans-SerifBold Italic Capital Psiname4=Mathematical Sans-SerifBold Italic Small Psi}}These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.

See also

{{Wiktionary|Ψ|ψ}}

Notes and references



- content above as imported from Wikipedia
- "psi (letter)" does not exist on GetWiki (yet)
- time: 11:24am EST - Sat, Feb 16 2019
[ this remote article is provided by Wikipedia ]
LATEST EDITS [ see all ]
GETWIKI 09 MAY 2016
GETWIKI 18 OCT 2015
M.R.M. Parrott
Biographies
GETWIKI 20 AUG 2014
GETWIKI 19 AUG 2014
GETWIKI 18 AUG 2014
Wikinfo
Culture
CONNECT