Dirichlet polynomial (source code)

= Dirichlet polynomial
{c}
{title2=$\sum_{n\le X}a_n n^{-s}$}

A <Dirichlet polynomial> is a finite <Dirichlet series>, $A(s)=\sum_{n\le X}a_n n^{-s}$. Vertical integration separates equal product indices from oscillatory unequal ones.