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A delta function or Dirac delta function (δ) is a generalized function on the real number line denoted by δ that is zero everywhere except at zero, with an integral of one over the entire real line.

Delta function may also refer to:

  • Kronecker delta, a function of two variables which is one for equal arguments and zero otherwise, and which forms the identity element of an incidence algebra
  • Modular discriminant (Δ), a complex function in Weierstrass's elliptic functions

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