Kronecker delta
The quality of not being physical.
To be correct about what one says or thinks.
plural of crossbar switch
(mathematics) A binary function, written as δ with two subscripts, which evaluates to 1 when its arguments are equal, and 0 otherwise.
行列要素を計算する際、δ_{ij}（クロネッカーのデルタ）は対角成分のみが寄与することを保証する。
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