This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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represents the Dirac delta function delta(x).
DiracDelta[x1, x2, ...]
represents the multidimensional Dirac delta function delta(x_1,x_2,…).
  • DiracDelta[x] returns 0 for all numeric x other than 0.
  • DiracDelta can be used in integrals, integral transforms and differential equations.
  • Some transformations are done automatically when DiracDelta appears in a product of terms.
  • DiracDelta[x1, x2, ...] returns 0 if any of the xi are numeric and not 0.
  • For exact numeric quantities, DiracDelta internally uses numerical approximations to establish its result. This process can be affected by the setting of the global variable $MaxExtraPrecision.
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