This note is a survey of the main results known about fixed subgroups
of endomorphisms of finitely generated free groups. A historic point
of view is taken, emphasizing the evolution of this line of research, from its
beginning to the present time. The article concludes with a section containing the main open problems and conjectures, with some comments and discussions on them.
CitationVentura, E. Fixed subgroups in free groups: a survey. "Contemporary mathematics", Març 2002, vol. 296, p. 231-255.
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