Kronecker Delta (Paperback)

High Quality Content by WIKIPEDIA articles! In mathematics, the Kronecker delta or Kronecker's delta, named after Leopold Kronecker (1823-1891), is a function of two variables, usually integers, which is 1 if they are equal, and 0 otherwise. So, for example, 1,2 = 0, but 3,3 = 1 It is written as the symbol ij, and treated as a notational shorthand rather than as a function.