Normalized sinc
From specialfunctionswiki
The normalized sinc function $\mathrm{sinc}_{\pi}$ is defined by $$\mathrm{sinc}_{\pi} = \left\{ \begin{array}{ll} \dfrac{\sin(\pi z)}{z}, & \quad z \neq 0 \\ 1, & \quad z=0. \end{array} \right.$$
