a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity
Symbol: δij
Word origin
named after Leopold Kronecker (1823–91), German mathematician
Kronecker delta in American English
noun
Math
a function of two variables, i and j, which equals 1 when the variables have the same value, i = j, and equals 0 when the variables have different values, i ≠ j