Psi (letter)

Greek alphabet
Α α Alpha Β β Beta
Γ γ Gamma Δ δ Delta
Ε ε Epsilon Ζ ζ Zeta
Η η Eta Θ θ Theta
Ι ι Iota Κ κ Kappa
Λ λ Lambda Μ μ Mu
Ν ν Nu Ξ ξ Xi
Ο ο Omicron Π π Pi
Ρ ρ Rho Σ σ Sigma
Τ τ Tau Υ υ Upsilon
Φ φ Phi Χ χ Chi
Ψ ψ Psi Ω ω Omega
obsolete letters
[[Digamma|Template:Polytonic Digamma]] [[San (letter)|Template:Polytonic San]]
[[Qoppa|Template:Polytonic Qoppa]] [[Sampi|Template:Polytonic Sampi]]

Psi (Ψ ψ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. It is also used as a symbol/icon for psychology.

It is perhaps most famous in science for representing a wavefunction in quantum mechanics, particularly with the Schrödinger equation.

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 Template:Math-stub da:Psi (bogstav) de:Psi el:Ψι es:Psi (letra) fr:Ψ ja:Ψ nl:Psi (letter) pl:Psi pt:Ψ sv:Psi zh:Ψ

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