Growth in linear groups
Presenter
February 9, 2012
Keywords:
- thin groups
- expander graph
- group theory
- monodromy group
- super-strong approximation
- matrix groups
- product theorem
MSC:
- 43A46
- 43A05
- 43A07
- 43Axx
- 43-xx
- 20-xx
Abstract
Let S be a finite symmetric subset of GL(n,F), F an arbitrary field, satisfying |S^3| < K|S| for some K > 1. Then there are normal subgroups P _< G of , such that G/P is soluble, P is a finite perfect group contained in S^6 and S is contained in the union of K^c(n) cosets of G, where c(n) depends only on n. This includes the Product Theorem for finite simple groups of bounded rank proved by Breuillard-Green-Tao and Pyber-Szabo and various other earlier results.