Dirac delta
词源说明
Named after English theoretical physicist Paul Dirac (1902–1984); the notation was chosen because the symbol behaves analogously to the Kronecker delta.
释义（英文）
名词 Noun
- (mathematics) A function-like symbol denoted as δ, with the property ∫f(t)δ(x−t)dt=f(x), informally understood as a function with an infinite value at 0 and zero elsewhere, and formally as a distribution or a measure.