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On the residual finiteness of outer automorphisms of relatively hyperbolic groups

V. Metaftsis, M. Sykiotis

math.GRarXiv:math/0608685

Abstract

We show that every virtually torsion-free subgroup of the outer automorphism group of a conjugacy separable relatively hyperbolic group is residually finite. As a direct consequence, we obtain that the outer automorphism group of a limit group is residually finite.

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