Dirac delta

English

Etymology

Template:Named-after; the notation was chosen because the symbol behaves analogously to the Kronecker delta.

Noun

1. Template:Lb A function-like symbol denoted as δ, with the property $\int f(t)\delta (x-t)\mathrm{d}t=f(x)$, informally understood as a function with an infinite value at 0 and zero elsewhere, and formally as a distribution or a measure. Template:C