δ

Definition from Wiktionary, the free dictionary
Jump to: navigation, search
Greek lc delta.svg
Character δ
Unicode name GREEK SMALL LETTER DELTA
Code point U+03B4
Unicode block Greek and Coptic
γ [U+03B3] [U+03B5] ε

Translingual[edit]

Symbol[edit]

δ

  1. (mathematics) A small increment or change in a variable.
    \delta x is a small change in variable x
  2. (mathematics, calculus of variations) Denotes a small — rather infinitesimalvariation of the value returned by a functional and/or of the functions on which that functional depends. This symbol can also — along a similar vein — be used to help denote virtual displacement and virtual work.
  3. (mathematics) A small number, usually accompanied by ε.
    • For any \epsilon>0, there is a \delta>0
  4. (mathematics) Kronecker delta or Dirac delta.

See also[edit]


Greek[edit]

Etymology[edit]

Derived from its majuscule counterpart Δ, from the Phoenician letter 𐤃, dalet.

Letter[edit]

δ (d) (lowercase, uppercase Δ)

  1. Lower case delta (δέλτα), the fourth letter of Greek alphabet. It represented in Ancient Greek a voiced dental plosive: IPA(key): /d/ and in modern Greek a voiced dental fricative: IPA(key): /ð/. It is preceded by γ and followed by ε.

Derived terms[edit]

See also[edit]