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In mathematics, the Kronecker delta (named after Leopold Kronecker), is a function of two variables, usually non-negative integers. The function is 1 if the variables are equal, and 0 otherwise: δ i j = { 0 if i ≠ j , 1 if i = j .
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Summarized and adapted from the article “Kronecker delta”, English Wikipedia. License CC BY-SA 4.0.
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