ψ

See also: Ψ, ⋔, ѱ, and Ѱ

ψ U+03C8, ψ GREEK SMALL LETTER PSI ← χ [U+03C7] Greek and Coptic ω → [U+03C9]

Translingual

Symbol

ψ

1. (quantum mechanics) a wavefunction
2. (electrical engineering) Electric flux.

Usage notes

Some texts use Ψ (uppercase) for the actual wavefunction that appears in the time-dependent Schrödinger equation, and ψ (=Ψe^iEt/ħ) (lowercase) for the time-independent spatial wave function that may exist for stationary states (and which then appears in the time-independent Schrödinger equation), but this distinction is not always observed. Otherwise, the distinction may be made by providing the arguments.

See also

• ψ on Wikipedia.Wikipedia

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Greek

Letter

ψ • (ps) (lowercase, uppercase Ψ)

1. The lower case letter psi (ψι), the 23rd letter of the modern Greek alphabet.

Derived terms

• ψ΄ (“700”)
• ͵ψ (“700,000”)

See also

• Appendix:Greek alphabet
• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨