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Psi function can refer, in mathematics, to the ordinal collapsing function ...
the J/psi mesons in particle physics; the stream function in fluid dynamics; the reciprocal Fibonacci constant [69] the second Chebyshev function in number theory [70] the polygamma function in mathematics [71] the supergolden ratio [72] In circadian physiology, ψ represents the phase relationship between a zeitgeber and a biological rhythm. [73]
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
The Noetic Learning math contest was founded in 2007 by Li Kelty. The company is based in Overland Park, Kansas. [6] The contest has grown over the years, with participants from various schools across the United States. [18] In Spring 2023, more than 35,000 students nationwide participated in the Noetic Learning Math Contest. [19]
There is an additive definition of the psi function as well. Quoting from Dickson, [ 1 ] R. Dedekind [ 2 ] proved that, if n {\displaystyle n} is decomposed in every way into a product a b {\displaystyle ab} and if e {\displaystyle e} is the g.c.d. of a , b {\displaystyle a,b} then
Psi (instant messaging client), XMPP client program Potentially Shippable Increment , in the Scrum software development methodology Program-specific information , part of the MPEG transport stream protocol
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The Greek alphabet on a black-figure pottery vessel, with an archaic chickenfoot-shaped psi.. Psi / ˈ (p) s aɪ, ˈ (p) s iː / (P)SY, (P)SEE [1] (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700.