Exponential sums with over integers without large prime divisors
Exponential sums with over integers without large prime divisors
We obtain a new bound on exponential sums over integers without large prime divisors, improving that of Fouvry and Tenenbaum (1991). The improvement is based on exploiting the trilinear structure of certain exponential sums, appearing in the argument. We combine this idea with some input from additive combinatorics and, for …