Free subgroups in almost subnormal subgroups of general skew linear groups

Abstract

Let $D$ be a weakly locally finite division ring and $n$ a positive integer. In this paper, we investigate the problem on the existence of non-cyclic free subgroups in non-central almost subnormal subgroups of the general linear group ${\mathrm{GL}}_n(D)$. Further, some applications of this fact are also investigated. In particular, all infinite finitely generated almost subnormal subgroups of ${\mathrm{GL}}_n(D)$ are described.

12 pages