Tau - Revision history

Beza 1598: /* References */

2016-03-11T13:03:18Z

References

← Older revision		Revision as of 13:03, 11 March 2016
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	{{Greek Lexicon}}		{{Greek Lexicon}}
	[[Category:Greek letters]]		[[Category:Greek letters]]

			{{Donate}}

Nick: /* Miscellaneous */

2015-03-30T09:36:37Z

Miscellaneous

← Older revision		Revision as of 09:36, 30 March 2015
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	==Miscellaneous==		==Miscellaneous==

	An essay written around 160 AD, attributed to [[Lucian]], a mock legal prosecution called ''The Consonants at Law — Sigma v. Tau in the Court of Seven Vowels'' contains a reference to the attribution. [[Sigma (letter)\|Sigma]] petitions the court to sentence Tau to death by crucifixion, saying:		An essay written around [[160 AD]], attributed to [[Lucian]], a mock legal prosecution called ''The Consonants at Law — Sigma v. Tau in the Court of Seven Vowels'' contains a reference to the attribution. [[Sigma (letter)\|Sigma]] petitions the court to sentence Tau to death by crucifixion, saying:
	:''Men weep, and bewail their lot, and curse Cadmus with many curses for introducing ''Tau'' into the family of letters; they say it was his body that tyrants took for a model, his shape that they imitated, when they set up structures on which men are crucified. ''Stauros'' (cross) the vile engine is called, and it derives its vile name from him. Now, with all these crimes upon him, does he not deserve death, nay, many deaths? For my part I know none bad enough but that supplied by his own shape — that shape which he gave to the [[gibbet]] named ''stauros'' after him by men.''		:''Men weep, and bewail their lot, and curse Cadmus with many curses for introducing ''Tau'' into the family of letters; they say it was his body that tyrants took for a model, his shape that they imitated, when they set up structures on which men are crucified. ''Stauros'' (cross) the vile engine is called, and it derives its vile name from him. Now, with all these crimes upon him, does he not deserve death, nay, many deaths? For my part I know none bad enough but that supplied by his own shape — that shape which he gave to the [[gibbet]] named ''stauros'' after him by men.''

Nick: /* References */

2015-01-20T11:41:56Z

References

← Older revision		Revision as of 11:41, 20 January 2015
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	== References ==		== References ==
			* 1. [http://tau.uoregon.edu Tuning and Analysis Utilities]

			{{Greek Lexicon}}
	[[Category:Greek letters]]		[[Category:Greek letters]]

	* 1. [http://tau.uoregon.edu Tuning and Analysis Utilities]

Nick: /* References */

2011-03-29T19:45:52Z

References

← Older revision		Revision as of 19:45, 29 March 2011
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	== References ==		== References ==
	[[Category:Greek letters]]		[[Category:Greek letters]]

			* 1. [http://tau.uoregon.edu Tuning and Analysis Utilities]

Nick: /* Scientific uses */

2011-03-29T19:45:31Z

Scientific uses

← Older revision		Revision as of 19:45, 29 March 2011
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	* [[Torque]], the rotational force in mechanics.		* [[Torque]], the rotational force in mechanics.
	* In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature.		* In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature.
	* Tuning and Analysis Utilities (TAU) performance evaluation tool, computer science <~~ref~~>[~~http://tau.uoregon.edu Tuning and Analysis Utilities~~]</~~ref~~>		* Tuning and Analysis Utilities (TAU) performance evaluation tool, computer science <sup>[1]</sup>
	* Used as the symbol for tangent by Richard Feynman in order to avoid any confusion caused by "tan"		* Used as the symbol for tangent by Richard Feynman in order to avoid any confusion caused by "tan"
	* The [[tau lepton]], an elementary particle in particle physics.		* The [[tau lepton]], an elementary particle in particle physics.
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	* [[Kendall's tau rank correlation coefficient]] as a non-parametric correlation measure in statistics.		* [[Kendall's tau rank correlation coefficient]] as a non-parametric correlation measure in statistics.
	* [[Torsion of a curve]] in differential geometry.		* [[Torsion of a curve]] in differential geometry.


	==Other uses==		==Other uses==

Nick at 19:44, 29 March 2011

2011-03-29T19:44:56Z

← Older revision		Revision as of 19:44, 29 March 2011
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	[[Image:Tau.png\|thumb\|150px\|Tau]]		[[Image:Tau.png\|thumb\|150px\|Tau]]
			'''Tau''' (uppercase '''Τ''', lowercase '''τ'''; Ταυ ˈtaf) is the 19th letter of the [[Greek alphabet]]. In the system of [[Greek numerals]] it has a value of 300. The name in English is pronounced ˈtaʊ\|, but in [[Modern Greek]] it is ˈtaf. This is because the pronunciation of the combination of Greek letters αυ has changed from ancient to modern times from one of [au] to either [av] or [af], depending on what follows (see [[Greek orthography]]).

			Letters that arose from tau include Roman [[T]] and Cyrillic [[Te (Cyrillic)\|Te]] (Т, τ).

			The symbolism of the [[cross]] was connected not only to the letter [[chi (letter)\|chi]], but also to tau, the equivalent of the last letter in the [[Phoenician alphabet\|Phoenician]] and Old Hebrew alphabets, and which was originally cruciform in shape.

			The letter occupies the [[Unicode]] slots U+03C4 (lowercase) and U+03A4 (uppercase). In HTML, they can be produced with [[List of XML and HTML character entity references\|named entities]] (<code>&tau;</code> and <code>&Tau;</code>), [[Numeric character reference\|decimal references]] (<code>&#964;</code> and <code>&#932;</code>), or [[Numeric character reference\|hexadecimal references]] (<code>&#x3C4;</code> and <code>&#x3A4;</code>).

			==Scientific uses==

			The lower-case letter τ is used as a symbol for:
			* The perceived motion-gap in [[General Tau Theory]], a psychological principle of perception.
			* [[Torque]], the rotational force in mechanics.
			* In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature.
			* Tuning and Analysis Utilities (TAU) performance evaluation tool, computer science <ref>[http://tau.uoregon.edu Tuning and Analysis Utilities]</ref>
			* Used as the symbol for tangent by Richard Feynman in order to avoid any confusion caused by "tan"
			* The [[tau lepton]], an elementary particle in particle physics.
			* The lifetime of a [[spontaneous emission]] process.
			* The specific tax amount.
			* The [[time constant]] of any device, such as an [[RC circuit]].
			* The dose interval in [[pharmacokinetics]].
			* [[Proper time]] in relativity.
			* The symbol of continuity in electro-flux resonance.
			* The symbol for [[tortuosity]] in hydrogeology.
			* A [[correlation coefficient\|coefficient of correlation]] — see [[Kendall's tau]].
			* The [[golden ratio]] 1.618..., although φ (phi) is more common
			* [[Ramanujan's tau function]] in number theory.
			* The [[divisor function]] in number theory.
			* Tau in [[astronomy]] is a measure of [[Opacity (optics)\|opacity]], or how much sunlight cannot penetrate the atmosphere.
			* [[Tau (protein)]] in biochemistry is a protein associated with microtubules and is implicated in neurodegenerative diseases such as Alzheimer's Disease and FTLD.
			* [[Shear stress]] in continuum mechanics.
			* The prefix of many stars, via the [[Bayer designation\|Bayer]] stellar designation system. ([[Tau Ceti]] is such a star.)
			* The expressed period of the freerunning rhythm of an animal (circadian rhythm terminology), i.e., the length of the daily cycle of an animal when kept in constant light or constant darkness
			* [[Kendall's tau rank correlation coefficient]] as a non-parametric correlation measure in statistics.
			* [[Torsion of a curve]] in differential geometry.


			==Other uses==
			* In ancient times, a symbol for [[life]] and/or [[resurrection]], whereas the eighth letter of the Greek alphabet, [[theta]], was considered the symbol of [[death]].
			* In Biblical times, the [[Taw]] was put on men to distinguish those who lamented sin, although newer versions of the Bible have replaced the ancient term “Taw” with "mark" ([[Ezekiel 9:4]]) or "signature" ([[Job 31:35]]). Its original sound value is a [[voiceless alveolar plosive]], IPA /t/,
			* Tau is usually considered as the symbol of [[Franciscan]] orders due to [[Saint Francis of Assisi\|St. Francis']] love for it, symbol of the redemption and of the [[Cross]]. Almost all Franciscan churches have painted a tau with two crossing arms, both with [[stigmata]], the one of Jesus and the other of Francis; usually members of the [[Secular Franciscan Order]] wear a wooden τ in a string with three knots around the neck.

			==Miscellaneous==

			An essay written around 160 AD, attributed to [[Lucian]], a mock legal prosecution called ''The Consonants at Law — Sigma v. Tau in the Court of Seven Vowels'' contains a reference to the attribution. [[Sigma (letter)\|Sigma]] petitions the court to sentence Tau to death by crucifixion, saying:
			:''Men weep, and bewail their lot, and curse Cadmus with many curses for introducing ''Tau'' into the family of letters; they say it was his body that tyrants took for a model, his shape that they imitated, when they set up structures on which men are crucified. ''Stauros'' (cross) the vile engine is called, and it derives its vile name from him. Now, with all these crimes upon him, does he not deserve death, nay, many deaths? For my part I know none bad enough but that supplied by his own shape — that shape which he gave to the [[gibbet]] named ''stauros'' after him by men.''

			== References ==
			[[Category:Greek letters]]

Nick at 19:43, 29 March 2011

2011-03-29T19:43:03Z

← Older revision		Revision as of 19:43, 29 March 2011
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	Ττ Tau		[[Image:Tau.png\|thumb\|150px\|Tau]]

Nick: Protected "Tau" [edit=autoconfirmed:move=autoconfirmed]

2009-03-01T03:38:02Z

Protected "Tau" [edit=autoconfirmed:move=autoconfirmed]

← Older revision	Revision as of 03:38, 1 March 2009
(No difference)

Nick: New page: Ττ Tau

2009-03-01T03:37:57Z

New page: Ττ Tau

New page

Ττ Tau