Kronecker delta
词源说明
Named after German mathematician Leopold Kronecker (1823–1891)
释义（英文）
名词 Noun
- (mathematics) A binary function, written as δ with two subscripts, which evaluates to 1 when its arguments are equal, and 0 otherwise.
- (mathematics) A unary function, written as δ with a single index, which evaluates to 1 at zero, and 0 elsewhere.