Let F be a finitely generated free group. By using Bestvina-Handel theory, as well
as some further improvements, the eigengroups of a given automorphism of F (and
its fixed subgroup among them) are globally analyzed and described. In particular,
an explicit description of all subgroups of F which occur as the fixed subgroup of
some automorphism is given.
CitationMartino, A.; Ventura, E. A description of auto-fixed subgroups in a free group. "Topology", Juny 2004, vol. 43, núm. -, p. 1133-1164.
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