Kronecker delta

noun Mathematics.
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, ij.

1925–30; named after L. Kronecker Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Kronecker delta (ˈkrɒnɪkə)
maths δij a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity
[named after Leopold Kronecker (1823--91), German mathematician]

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