, Volume 10, Issue 5, pp 1071-1089

Hyperbolic automorphisms of free groups

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Abstract.

We prove that an automorphism $ {\not o} : F \to F $ of a finitely generated free group F is hyperbolic in the sense of Gromov if it has no nontrivial periodic conjugacy classes. This result was previously claimed (but not proved) in [BF1].

Submitted: April 1999, Revised version: July 1999, Final version: September 1999.