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Additive structures in sumsets

Tom Sanders

math.NTarXiv:math/0605520

Abstract

Suppose that A is a subset of the integers 1,...,N of density a. We provide a new proof of a result of Green which shows that A+A contains an arithmetic progression of length exp(ca(log N)1/2) for some absolute c>0. Furthermore we improve the length of progression guaranteed in higher sumsets; for example we show that A+A+A contains a progression of length roughly Nca improving on the previous best of Nca2+ε.

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