A note on separability in outer automorphism groups
arXiv:2407.13824 · doi:10.1017/S0013091525000045
Abstract
We give a criterion for separability of subgroups of certain outer automorphism groups. This answers questions of Hagen and Sisto, by strengthening and generalizing a result of theirs on mapping class groups.
6 pages. v2: added Propositions 2.6 and 2.8; final version, to appear in Proceedings of the Edinburgh Mathematical Society