Quasipolynomial
= Quasipolynomial
{wiki}
A quasipolynomial is a function $f:\mathbb Z\to\mathbb C$ for which there are <polynomial>[polynomials] $P_0,\ldots,P_{m-1}$ such that $f(n)=P_r(n)$ whenever $n\equiv r\pmod m$. The least possible positive $m$ is its period.