kronecker delta

English Thesaurus

1. a function of two variables i and j that equals 1 when i=j and equals 0 otherwise (noun.linkdef)

hypernym	:	function, map, mapping, mathematical function, single-valued function,
definition	:	(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) (noun.linkdef)