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

Abstract

We prove that if G is a finite simple group of Lie type and S1, . . . , S k are subsets of G satisfying k i=1 |Si| |G| c for some c depending only on the rank of G, then there exist elements g1, . . . , g k such that G = (S1) g 1 · · · (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 SLn(q), as well as to the Product Decomposition Conjecture of Liebeck, Nikolov and Shalev.