Long Arithmetic Progressions in Critical Sets
Ernie Croot
Abstract
In this paper we prove: If 0 < d < 1, and p is a sufficiently large prime, then if S is a subset of Z/pZ having the least number of three-term arithmetic progressions among all subsets of Z/pZ having at least dp elements, then S has an arithmetic progression of length at least log1/4+o(1) x.
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