Delta function

Delta function may mean:

Dirac delta function, $\delta (x)={\begin{cases}\infty ,&x=0\\0,&x\neq 0\end{cases}}$

Kronecker delta, $\delta _{ij}=\left\{{\begin{matrix}1,&{\mbox{if }}i=j\\0,&{\mbox{if }}i\neq j\end{matrix}}\right.$

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