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Oriol Serra; Gilles Zémor
Large sets with small doubling modulo $p$ are well covered by an arithmetic progression
(Les grands ensembles d’entiers de petite somme modulo $p$ sont contenus dans des progressions arithmétiques courtes)
Annales de l'institut Fourier, 59 no. 5 (2009), p. 2043-2060, doi: 10.5802/aif.2482
Article: subscription required (your ip address: 50.16.36.153) | Reviews MR 2573196 | Zbl pre05641407
Class. Math.: 11P70
Keywords: Sumset, arithmetic progression, additive combinatorics

Résumé - Abstract

We prove that there is a small but fixed positive integer $\epsilon $ such that for every prime $p$ larger than a fixed integer, every subset $S$ of the integers modulo $p$ which satisfies $|2S|\le (2+\epsilon )|S|$ and $2(|2S|)-2|S|+3\le p$ is contained in an arithmetic progression of length $|2S|-|S|+1$. This is the first result of this nature which places no unnecessary restrictions on the size of $S$.

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