Verbally closed virtually free subgroups

Published 24 Feb 2017 in math.GR | (1702.07761v5)

Abstract: A theorem of Myasnikov and Roman'kov says that any verbally closed subgroup of a finitely generated free group is a retract. We prove that all free (and many virtually free) verbally closed subgroups are retracts in any finitely generated group.

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