A Class of Incomplete Character Sums

Abstract

Using $\ell$-adic cohomology of tensor inductions of lisse ${\overline{\mathbb{Q}}}_{\ell }$-sheaves, we study a class of incomplete character sums.

José Alves Oliveira and Lucas Reis point out an error in the old version of Theorem 4.6. The assumption that Tr(g) is not of the form r^q-r is corrected to that Tr(g) is not of the form r^p-r