Beza 1598: /* References */

2016-03-10T07:45:28Z

References

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	[[Category:Greek letters]]		[[Category:Greek letters]]

			{{Donate}}

Nick at 01:15, 21 February 2015

2015-02-21T01:15:36Z

← Older revision		Revision as of 01:15, 21 February 2015
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	[[Image:pi.~~png~~\|thumb\|150px\|Pi]]		[[Image:pi.jpg\|thumb\|150px\|Pi]]
	'''Pi''' (uppercase '''Π''', lower case '''π''') is the sixteenth letter of the [[Greek alphabet]], representing [p]. In the system of [[Greek numerals]] it has a value of 80. Letters that arose from pi include [[Cyrillic alphabet\|Cyrillic]] [[Pe (Cyrillic)\|Pe]] (П, п), [[Coptic alphabet\|Coptic]] pi (Ⲡ, ⲡ), and [[Gothic alphabet\|Gothic]] [[pairthra]] (𐍀).		'''Pi''' (uppercase '''Π''', lower case '''π''') is the sixteenth letter of the [[Greek alphabet]], representing [p]. In the system of [[Greek numerals]] it has a value of 80. Letters that arose from pi include [[Cyrillic alphabet\|Cyrillic]] [[Pe (Cyrillic)\|Pe]] (П, п), [[Coptic alphabet\|Coptic]] pi (Ⲡ, ⲡ), and [[Gothic alphabet\|Gothic]] [[pairthra]] (𐍀).

Nick at 23:47, 24 March 2011

2011-03-24T23:47:09Z

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	Ππ Pi		[[Image:pi.png\|thumb\|150px\|Pi]]
			'''Pi''' (uppercase '''Π''', lower case '''π''') is the sixteenth letter of the [[Greek alphabet]], representing [p]. In the system of [[Greek numerals]] it has a value of 80. Letters that arose from pi include [[Cyrillic alphabet\|Cyrillic]] [[Pe (Cyrillic)\|Pe]] (П, п), [[Coptic alphabet\|Coptic]] pi (Ⲡ, ⲡ), and [[Gothic alphabet\|Gothic]] [[pairthra]] (𐍀).

			In Modern Greek, the name of the letter is pronounced ˈpi\|; in modern English, it is ˈpaɪ, in particular when referring to the [[Pi\|mathematical constant]] (see below).

			The upper-case letter Π is used as a symbol for:
			* The [[product (mathematics)\|product]] operator in mathematics, indicated with [[Multiplication#Capital Pi notation\|capital pi notation]] ∏ (in analogy to the use of the capital [[Sigma]] Σ as [[summation]] symbol).
			* In [[textual criticism]], ''Codex Petropolitanus'', a 9th century, [[uncial]] [[codex]] of the [[Gospel]]s, now located in [[St. Petersburg, Russia]].
			* In [[legal shorthand]], it represents a [[plaintiff]].
			The lower-case letter π is used as a symbol for:
			* The mathematical [[Transcendental number\|transcendental]] (and thus [[Irrational number\|irrational]]) [[Pi\|constant '''π''']] ≈ 3.14159…, the ratio of a [[circle]]'s [[circumference]] to its [[diameter]] in [[Euclidean geometry]]. The letter "π" is the first letter of the Greek words "περιφέρεια" 'periphery' and "περίμετρος" 'perimeter', ''i.e.'' the circumference.
			* The [[prime-counting function]] in mathematics.
			* [[Homotopy group]]s in algebraic topology.
			* Dimensionless parameters constructed using the [[Buckingham π theorem]] of [[dimensional analysis]].
			* The [[osmotic pressure]] in chemistry. π=MRT
			* The [[elementary particle]] called the [[pion\|pi meson or pion]].
			* [[Profit (economics)\|Economic profit]] in microeconomics.
			* [[Inflation]] rate in macroeconomics.
			* A type of [[chemical bond]] in which the P-orbitals overlap, called a [[pi bond]].
			* The natural projection on the [[tangent bundle]] on a [[manifold (mathematics)\|manifold]].
			* The unary operation of [[Projection (relational algebra)\|projection]] in [[relational algebra]].

			'''Variant pi''' or "pomega" (<math>\varpi\,\!</math> or ϖ) is a [[glyph]] variant of lower case pi sometimes used in technical contexts as though it were a lower-case [[omega]] with a [[macron]], though historically it is simply a [[cursive]] form of pi, with its legs bent inward to meet. It is used as a symbol for:
			* [[perihelion]]
			* The [[angular frequency]] of a [[ocean surface wave\|wave]] in [[fluid dynamics]] (angular frequency is usually represented by <math>\omega</math> but this may be confused with [[vorticity]] in a fluid dynamics context).
			* The [[longitude of pericenter]] in [[celestial mechanics]].<sup>[]</sup>
			* [[Comoving distance]] in cosmology.<sup>[]</sup>

			In [[Unicode]], the code point for capital Π is U+03A0 and for lower-case π it is U+03C0. The code point for ϖ, called greek pi symbol, is U+03D6, and that for the product symbol ∏, called n-ary product, is U+220F.

			In [[HTML]], the capital letter Π can be produced using the codes &Pi; or &#928;, and the lower-case by using &pi; or &#960; within the source code.<sup>[]</sup>

			== See also ==
			*[[Pe (Cyrillic)\|П, п - Pe (Cyrillic)]]
			*[[Er (Cyrillic)\|Р, р - Er (Cyrillic)]]
			*[[P\|P, p - Pe (Latin)]]

			== References ==

			[[Category:Greek letters]]

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

2009-03-01T03:37:07Z

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

← Older revision	Revision as of 03:37, 1 March 2009
(No difference)

Nick: New page: Ππ Pi

2009-03-01T03:37:03Z

New page: Ππ Pi

New page

Ππ Pi

Pi - Revision history

Beza 1598: /* References */

Nick at 01:15, 21 February 2015

Nick at 23:47, 24 March 2011

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

Nick: New page: Ππ Pi