Psi - Revision history

Beza 1598: /* Notes and references */

Beza 1598 — Thu, 10 Mar 2016 08:08:07 GMT

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 */

Nick — Sat, 09 Apr 2011 15:12:49 GMT

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 */

Nick — Sat, 09 Apr 2011 15:12:09 GMT

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 */

Nick — Sat, 09 Apr 2011 15:10:30 GMT

Meanings

←Older revision		Revision as of 15:10, 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.~~jpg~~]]	+	:[[Image:d25a90bda61e5f6d1becfa0b07a96e49.png]]
	where <math>\Gamma (x)</math> is the [[gamma function]].		where <math>\Gamma (x)</math> is the [[gamma function]].

Nick: /* Meanings */

Nick — Sat, 09 Apr 2011 15:09:59 GMT

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

Nick — Sat, 09 Apr 2011 15:09:07 GMT

←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

Nick — Sat, 09 Apr 2011 15:06:35 GMT

←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

Nick — Sat, 16 Jan 2010 08:21:23 GMT

←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

Nick — Sat, 16 Jan 2010 08:20:06 GMT

←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

Nick — Sat, 16 Jan 2010 08:19:38 GMT

←Older revision		Revision as of 08:19, 16 January 2010
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-	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]]