Ajtai-Szemerédi Theorems over quasirandom groups

Abstract

Two versions of the Ajtai-Szemerédi Theorem are considered in the Cartesian square of a finite non-Abelian group $G$. In case $G$ is sufficiently quasirandom, we obtain strong forms of both versions: if $E\subseteq G\times G$ is fairly dense, then $E$ contains a large number of the desired patterns for most individual choices of `common difference'. For one of the versions, we also show that this set of good common differences is syndetic.

29p. [v2:] Added some references [v3:] Some more references added and small mistakes corrected

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• Triangles in cartesian squares of quasirandom groups