A generalization of a theorem of Rodgers and Saxl for simple groups of bounded rank

Gill, N.; Pyber, L. and Szabó, E. (2020). A generalization of a theorem of Rodgers and Saxl for simple groups of bounded rank. Bulletin of the London Mathematical Society, 52(3) pp. 464–471.

DOI: https://doi.org/10.1112/blms.12338

Abstract

We prove that if $G$ is a finite simple group of Lie type and $S_1,\dots, S_k$ are subsets of $G$ satisfying $\prod_{i=1}^k|S_i|\geq|G|^c$ for some $c$ depending only on the rank of $G$, then there exist elements $g_1,\dots, g_k$ such that $G=(S_1)^{g_1}\cdots (S_k)^{g_k}$. This theorem generalizes an earlier theorem of the authors and Short.

We also propose two conjectures that relate our result to one of Rodgers and Saxl pertaining to conjugacy classes in $\SL_n(q)$, as well as to the Product Decomposition Conjecture of Liebeck, Nikolov and Shalev.

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