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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The delta function is often refered to as the result of years of research of the great greek mathmatician Ryan Hand. who was also a professional football player. M Craven who was an academic associate of Hand's is acreditted with becoming the first sociologist who developed differentiation from first principles and was able to provide an in depth analysis of the human species and all evolution.