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Bibliographic Details
Main Author:	Shao, Xuancheng
Format:	Preprint
Published:	2026
Subjects:	Number Theory
Online Access:	https://arxiv.org/abs/2604.17117
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Table of Contents:

Let $\mathbb{F}_p$ be a finite field of prime order $p$ and let $A \subset \mathbb{F}_p$ be a subset. In the dense regime when $|A| \geq αp$ for some $α\in (0,1)$, we determine the optimal constant $f(α)$ in the inequality $$ \max(|A+A|, |A\cdot A|) \geq (f(α) - o(1))p. $$ The proof relies on a structural result for sumsets of dense subsets, established via a regularity lemma in general finite abelian groups.