The linearity problem for the unitriangular automorphism groups of free groups

Abstract

We prove that the unitriangular automorphism group of a free group of rank $n$ has a faithful representation by matrices over a field, or in other words, it is a linear group, if and only if $n\le 3.$ Thus, we have completed a description of relatively free groups with linear the unitriangular automorphism groups. This description was initiated by Erofeev and the author in \cite{Erofeev}, where proper varieties of groups have been considered.

References in corpus (1)

• On the linearity problem for mapping class groups

Cited by in corpus (1)

• On linearity of automorphism groups of algebras and groups