Compressions, convex geometry and the Freiman-Bilu theorem
Ben Green, Terence Tao
Abstract
We note a link between combinatorial results of Bollobás and Leader concerning sumsets in the grid, the Brunn-Minkowski theorem and a result of Freiman and Bilu concerning the structure of sets of integers with small doubling. Our main result is the following. If eps > 0 and if A is a finite nonempty subset of a torsion-free abelian group with |A + A| <= K|A|, then A may be covered by exp(KC) progressions of dimension [log2 K + eps] and size at most |A|.
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