The automorphism group of a free-by-cyclic group in rank 2

Other authors

Universitat Politècnica de Catalunya. Departament de Matemàtiques

Universitat Politècnica de Catalunya. COMBGRAPH - Combinatòria, Teoria de Grafs i Aplicacions

Universitat Politècnica de Catalunya. MD - Matemàtica Discreta

Publication date

2007-05

Abstract

Let ¡ be an automorphism of a free group F 2 of rank 2 and let M ¡ = F 2 o ¡ Z be the corresponding mapping torus of ¡ . We prove that the group Out ( M ¡ ) is usually virtually cyclic. More- over, we classify the cases when this group is Ønite depending on the conjugacy class of the image of ¡ in GL 2 ( Z )


Award-winning


Postprint (author's final draft)

Document Type

Article

Language

English

Related items

http://www.informaworld.com/smpp/content~content=a778212731~db=all~order=page

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Rights

Open Access

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E-prints [73020]