Kronecker delta

In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just positive integers. The function is 1 if the variables are equal, and 0 otherwise:

where the Kronecker delta δ_ij is a piecewise function of variables i and j. For example, δ_{1 2} = 0, whereas δ_{3 3} = 1.

单词	Generalized Kronecker delta
释义	Generalized Kronecker delta 英语百科 Kronecker delta In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just positive integers. The function is 1 if the variables are equal, and 0 otherwise: where the Kronecker delta δ_ij is a piecewise function of variables i and j. For example, δ_{1 2} = 0, whereas δ_{3 3} = 1.
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Generalized Kronecker delta

Kronecker delta