Psi - Revision history

Beza 1598: /* Notes and references */

2016-03-10T08:08:07Z

Notes and references

← Older revision		Revision as of 08:08, 10 March 2016
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	{{DEFAULTSORT:Psi (Letter)}}		{{DEFAULTSORT:Psi (Letter)}}
	[[Category:Greek letters]]		[[Category:Greek letters]]

			{{Donate}}

Nick: /* Meanings */

2011-04-09T15:12:49Z

Meanings

← Older revision		Revision as of 15:12, 9 April 2011
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	*In [[virology]] the ψ site is a viral packaging signal.		*In [[virology]] the ψ site is a viral packaging signal.
	*The [[J/ψ]] meson, in [[particle physics]].		*The [[J/ψ]] meson, in [[particle physics]].
	*In the [[computability theory]], [[10088f07ae0e9268de513c6aef0727e1.png]] represents the return value [[450d2dc6fe8d5f78058c817a8dea51ec.png]] of a program [[fe6b6f2dcae650d9e649d40ca981681d.png]].		*In the [[computability theory]], [[Image:10088f07ae0e9268de513c6aef0727e1.png]] represents the return value [[Image:450d2dc6fe8d5f78058c817a8dea51ec.png]] of a program [[Image:fe6b6f2dcae650d9e649d40ca981681d.png]].
	*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.		*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.
	*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps]].		*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps]].

Nick: /* Meanings */

2011-04-09T15:12:09Z

Meanings

← Older revision		Revision as of 15:12, 9 April 2011
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	Psi is also used as the symbol for the [[polygamma function]], defined by		Psi is also used as the symbol for the [[polygamma function]], defined by
	:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.png]]		:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.png]]
	where ~~<math>\Gamma~~ (x)~~</math>~~ is the [[gamma function]].		where Γ(x) is the [[gamma function]].

	The letters Ψ or ψ can also be a symbol for:		The letters Ψ or ψ can also be a symbol for:
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	*In [[virology]] the ψ site is a viral packaging signal.		*In [[virology]] the ψ site is a viral packaging signal.
	*The [[J/ψ]] meson, in [[particle physics]].		*The [[J/ψ]] meson, in [[particle physics]].
	*In the [[computability theory]], ~~<math> \psi_P(x)\,\!</math>~~ represents the return value ~~<math> Y\,\!</math>~~ of a program ~~<math> P\,\!</math>~~.		*In the [[computability theory]], [[10088f07ae0e9268de513c6aef0727e1.png]] represents the return value [[450d2dc6fe8d5f78058c817a8dea51ec.png]] of a program [[fe6b6f2dcae650d9e649d40ca981681d.png]].
	*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.		*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.
	*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps]].		*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps]].

Nick: /* Meanings */

2011-04-09T15:10:30Z

Meanings

← Older revision		Revision as of 15:10, 9 April 2011
Line 6:		Line 6:

	Psi is also used as the symbol for the [[polygamma function]], defined by		Psi is also used as the symbol for the [[polygamma function]], defined by
	:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.~~jpg~~]]		:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.png]]
	where <math>\Gamma (x)</math> is the [[gamma function]].		where <math>\Gamma (x)</math> is the [[gamma function]].

Nick: /* Meanings */

2011-04-09T15:09:59Z

Meanings

← Older revision		Revision as of 15:09, 9 April 2011
Line 6:		Line 6:

	Psi is also used as the symbol for the [[polygamma function]], defined by		Psi is also used as the symbol for the [[polygamma function]], defined by
	:~~<math> \psi_n(x) = \frac{d^{(n)}}{dx^{(n)}}\frac{\Gamma '(x)}{\Gamma (x)}\,\!</math>~~		:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.jpg]]
	where <math>\Gamma (x)</math> is the [[gamma function]].		where <math>\Gamma (x)</math> is the [[gamma function]].

Nick at 15:09, 9 April 2011

2011-04-09T15:09:07Z

← Older revision		Revision as of 15:09, 9 April 2011
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	[[Image:psi.png\|thumb\|150px\|Psi]]		[[Image:psi.png\|thumb\|150px\|Psi]]
	'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced ~~in English as~~ ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.		'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced ˈsaɪ ''sigh'' or ˈpsaɪ\|, ''psigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/ at the beginning of a word.

			==Meanings==
			The letter psi is commonly used in [[physics]] for representing a [[wavefunction]] in [[quantum mechanics]], particularly with the [[Schrödinger equation]] and [[bra-ket notation]]: <math>\langle\phi\|\psi\rangle</math>. 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
			:<math> \psi_n(x) = \frac{d^{(n)}}{dx^{(n)}}\frac{\Gamma '(x)}{\Gamma (x)}\,\!</math>
			where <math>\Gamma (x)</math> is the [[gamma function]].

	The letters Ψ or ψ can also be a symbol for:		The letters Ψ or ψ can also be a symbol for:
	*[[psychology]], [[psychiatry]], and sometimes [[parapsychology]] (involving [[paranormal]] or relating with the [[supernatural]] subjects).		*[[psychology]], [[psychiatry]], and sometimes [[parapsychology]] (involving [[paranormal]] or relating with the [[supernatural]] subjects, especially research into extrasensory perception).
	*In mathematics, the [[reciprocal Fibonacci constant]].		*In mathematics, the [[reciprocal Fibonacci constant]].
	*[[Water potential]] in movement of water between plant cells.		*[[Water potential]] in movement of water between plant cells.
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	*In [[virology]] the ψ site is a viral packaging signal.		*In [[virology]] the ψ site is a viral packaging signal.
	*The [[J/ψ]] meson, in [[particle physics]].		*The [[J/ψ]] meson, in [[particle physics]].
			*In the [[computability theory]], <math> \psi_P(x)\,\!</math> represents the return value <math> Y\,\!</math> of a program <math> P\,\!</math>.
	*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.		*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.
	*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps~~\|Psi Corps~~]].		*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps]].
			*In [[circadian physiology]], ψ represents the phase relationship between a [[zeitgeber]] and a [[biological rhythm]].

	==See also==		==See also==
	*[[Psi and phi type figurine]]		*[[Psi and phi type figurine]]
	*[[Psi (Cyrillic)]]		*[[Psi (Cyrillic)]]

			== Notes and references ==

			{{DEFAULTSORT:Psi (Letter)}}
	[[Category:Greek letters]]		[[Category:Greek letters]]

Nick at 15:06, 9 April 2011

2011-04-09T15:06:35Z

← Older revision		Revision as of 15:06, 9 April 2011
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			[[Image:psi.png\|thumb\|150px\|Psi]]
	'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced in English as ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.		'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced in English as ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.

Nick at 08:21, 16 January 2010

2010-01-16T08:21:23Z

← Older revision		Revision as of 08:21, 16 January 2010
Line 1:		Line 1:
	'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced in English as ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.		'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced in English as ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.

	The letter psi is commonly used in [[physics]] for representing a [[wavefunction]] in [[quantum mechanics]], particularly with the [[Schrödinger equation]] and [[bra-ket notation]]: <math>\langle\phi\|\psi\rangle</math>. It is also used to represent the (generalized) positional states of a [[qubit]] in a [[quantum computer]].

	The letters Ψ or ψ can also be a symbol for:		The letters Ψ or ψ can also be a symbol for:

Nick at 08:20, 16 January 2010

2010-01-16T08:20:06Z

← Older revision		Revision as of 08:20, 16 January 2010
Line 2:		Line 2:

	The letter psi is commonly used in [[physics]] for representing a [[wavefunction]] in [[quantum mechanics]], particularly with the [[Schrödinger equation]] and [[bra-ket notation]]: <math>\langle\phi\|\psi\rangle</math>. It is also used to represent the (generalized) positional states of a [[qubit]] in a [[quantum computer]].		The letter psi is commonly used in [[physics]] for representing a [[wavefunction]] in [[quantum mechanics]], particularly with the [[Schrödinger equation]] and [[bra-ket notation]]: <math>\langle\phi\|\psi\rangle</math>. 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~~
	~~:<math> \psi_n(x) = \frac{d^{(n)}}{dx^{(n)}}\frac{\Gamma '(x)}{\Gamma (x)}\,\!</math>~~
	~~where <math>\Gamma (x)</math> is the [[gamma function]].~~

	The letters Ψ or ψ can also be a symbol for:		The letters Ψ or ψ can also be a symbol for:

Nick at 08:19, 16 January 2010

2010-01-16T08:19:38Z

← Older revision		Revision as of 08:19, 16 January 2010
Line 1:		Line 1:
	Ψ ψ Psi		'''Psi''' (uppercase '''Ψ''', lowercase '''ψ'''; pronounced in English as ''sigh'') is the 23rd letter of the [[Greek alphabet]] and has a [[Greek numerals\|numeric]] value of 700. In both [[Classical Greek\|Classical]] and [[Modern Greek]], the letter indicates the combination /ps/ (like in English "lapse"). The letter was adopted into the [[Old Italic alphabet]], and its shape is continued into the [[Algiz]] rune of the [[Elder Futhark]]. Psi was also adopted into the [[early Cyrillic alphabet]] as [[psi (Cyrillic)\|Ѱ]]. In Greek loanwords in Latin and modern languages with Latin alphabets, Psi is usually transliterated as "ps". In English, due to [[English phonology#Phonotactics\|phonotactic constraints]], its pronunciation is usually simplified to /s/.

			The letter psi is commonly used in [[physics]] for representing a [[wavefunction]] in [[quantum mechanics]], particularly with the [[Schrödinger equation]] and [[bra-ket notation]]: <math>\langle\phi\|\psi\rangle</math>. 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
			:<math> \psi_n(x) = \frac{d^{(n)}}{dx^{(n)}}\frac{\Gamma '(x)}{\Gamma (x)}\,\!</math>
			where <math>\Gamma (x)</math> is the [[gamma function]].

			The letters Ψ or ψ can also be a symbol for:
			*[[psychology]], [[psychiatry]], and sometimes [[parapsychology]] (involving [[paranormal]] or relating with the [[supernatural]] subjects).
			*In mathematics, the [[reciprocal Fibonacci constant]].
			*[[Water potential]] in movement of water between plant cells.
			*In [[biochemistry]], it denotes the rare [[nucleotide]] [[Pseudouridine\|pseudouridilic acid]].
			*[[Stream function]] in [[fluid mechanics]] defining the curve to which the [[flow velocity]] is always [[tangent]].
			*One of the [[dihedral angle]]s in the backbones of [[proteins]]
			*The planet [[Neptune]]
			*The [[Schrödinger equation]] and throughout [[quantum mechanics]], ψ(x) stands for the [[wave function]]
			*[[Indiana University]] (as a superimposed [[I]] and [[U]])
			*[[Gangster Disciples]]
			*A [[Sai (weapon)\|Sai]], the name of which is pronounced the same way.
			*[[Pharmacology]], general [[pharmacy]]
			*In [[virology]] the ψ site is a viral packaging signal.
			*The [[J/ψ]] meson, in [[particle physics]].
			*In the comic [[Monochrome]], Psi is a mentally disturbed character, though her name is usually spelled out.
			*In the television show [http://babylon5.warnerbros.com/ Babylon 5], Ψ is the symbol of the [[Psi Corps\|Psi Corps]].

			==See also==
			*[[Psi and phi type figurine]]
			*[[Psi (Cyrillic)]]
			[[Category:Greek letters]]