Some examples of sets of large exponential sums

Abstract

Let $A$ be a subset of $\mathbb{Z}/N\mathbb{Z}$ and let $\mathcal{R}$ be the set of large Fourier coefficients of $A$. Properties of $\mathcal{R}$ have been studied in works of M.-- C. Chang, B. Green and the author. In the paper we obtain some new results on sets of large exponential sums.

27 pages

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