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Encyclopedia > Psi (letter)
Look up Ψ, ψ in Wiktionary, the free dictionary.
Greek alphabet Obsolete letters Α α Alpha Ν ν Nu Β β Beta Ξ ξ Xi Γ γ Gamma Ο ο Omicron Δ δ Delta Π π Pi Ε ε Epsilon Ρ ρ Rho Ζ ζ Zeta Σ σ ς Sigma Η η Eta Τ τ Tau Θ θ Theta Υ υ Upsilon Ι ι Iota Φ φ Phi Κ κ Kappa Χ χ Chi Λ λ Lambda Ψ ψ Psi Μ μ Mu Ω ω Omega Ϝ ϝ Digamma Ϻ ϻ San Ϙ ϙ Qoppa Ϡ ϡ Sampi Ϛ ϛ Stigma Ϸ ϸ Sho diacritics
For other uses, see Psi.

The letter may have originated from the practise of writing the sigma over the pi, eventually making the combination into a single letter. Psi was also adopted into the early Cyrillic alphabet. See psi (Cyrillic) (Ѱ, ѱ). For other uses, see Sigma (disambiguation). ... When a circles diameter is 1, its circumference is Ï€. The mathematical constant Ï€ is an irrational real number, approximately equal to 3. ... The original Cyrillic alphabet was a writing system developed in the First Bulgarian Empire in the tenth century to write the Old Church Slavonic liturgical language. ... Psi (Ñ°, Ñ±) is a letter in the early Cyrillic alphabet, derived from the Greek letter psi (Î¨, Ïˆ). It represents the sound /ps/, as in English naps, and was used largely in loan words from foreign languages. ...

The letter psi is commonly used in physics for representing a wavefunction in quantum mechanics, particularly with the Schrödinger equation and bra-ket notation: $langlephi|psirangle$. It is also used to represent the (generalized) positional states of a qubit in a quantum computer. Physics (from the Greek, (phÃºsis), nature and (phusikÃ©), knowledge of nature) is the science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space, and time. ... This article discusses the concept of a wavefunction as it relates to quantum mechanics. ... Fig. ... In physics, the SchrÃ¶dinger equation, proposed by the Austrian physicist Erwin SchrÃ¶dinger in 1925, describes the space- and time-dependence of quantum mechanical systems. ... Bra-ket notation is the standard notation for describing quantum states in the theory of quantum mechanics. ... To meet Wikipedias quality standards and make it more accessible, this article needs a better explanation of technical details or more context regarding applications or importance to make it more accessible to a general audience, or at least to technical readers outside this specialty. ... The Bloch sphere is a representation of a qubit, the fundamental building block of quantum computers. ...

Psi is also used as the symbol for the polygamma function, defined by In mathematics, the polygamma function of order m is defined as the m+1 th derivative of the logarithm of the gamma function: Here is the digamma function and is the gamma function. ...

$psi_n(x) = frac{d^{(n)}}{dx^{(n)}}frac{Gamma '(x)}{Gamma (x)},!$

where Γ(x) is the gamma function. The Gamma function along part of the real axis In mathematics, the Gamma function extends the factorial function to complex and non integer numbers (it is already defined on the naturals, and has simple poles at the negative integers). ...

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

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 PSI TECH Privacy Statement (1731 words) PSI TECH, Inc. respects the privacy of all of its users and is committed to protecting such privacy in accordance with this Privacy Policy. PSI TECH may also use Personal Information if it has reasonable grounds to believe the information could be useful when investigating a contravention of a federal, provincial or foreign law or in order to protect or defend a legal interest. In connection with a PSI TECH corporate re-organization, merger or amalgamation with another entity, or a sale of all or a substantial portion of the assets of PSI TECH provided that the Personal Information disclosed continues to be used for the purposes permitted by this Privacy Policy by the entity acquiring the information.
 PSI | Home (511 words) PSI has written a letter to the FNA fully supporting its attempts to secure the pay and working conditions that Fijis nurses deserve. The government has refused to negotiate since the unions went on strike early May. The public sector workers are asking for a re-evaluation of the public sector pay scale and an increase in the minumum wage and pensions. PSI is appealing to its affiliated organisations to support its affiliate, the Sindicato de Empresa Trabajadores de ANDA (SETA) and write letters of protest to President Antonio Elías Saca condemning the recent acts of violence against participants of a public meeting to oppose water privatisation in El Salvador.
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