TR12-180 Authors: Chaim Even-Zohar, Shachar Lovett

Publication: 21st December 2012 14:28

Downloads: 2677

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Let $G$ be a finite abelian group of torsion $r$ and let $A$ be a subset of $G$.

The Freiman-Ruzsa theorem asserts that if $|A+A| \le K|A|$

then $A$ is contained in a coset of a subgroup of $G$ of size at most $K^2 r^{K^4} |A|$. It was conjectured by Ruzsa that the subgroup size can be reduced to $r^{CK}$ for some absolute constant $C \geq 2$.

This conjecture was verified for $r=2$ in a sequence of recent works,

which have, in fact, yielded a tight bound. In this work, we establish the same conjecture for any prime torsion.