Dirac delta

Meaning

Noun

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

Origin

• ; the notation was chosen because the symbol behaves analogously to the Kronecker delta.