Exponential sums over small subgroups, revisited
arXiv:2401.04756
Abstract
This is an expository account of the proof of the theorem of Bourgain, Glibichuk and Konyagin which provides non-trivial bounds for exponential sums over very small multiplicative subgroups of prime finite fields.
v2; 22 pages, survey paper; minor corrections and added references, in particular to work of Shkredov