Delta function

Delta function may refer to:

the distribution called the Dirac delta function, a generalized function; $\langle \delta ,\varphi \rangle =\varphi (0)$

or the indexed matrix, called the Kronecker delta, an order-2 tensor, $\delta _{ij}=\left\{{\begin{matrix}1,&{\mbox{if }}i=j\\0,&{\mbox{if }}i\neq j\end{matrix}}\right.$

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