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We have decided to discontinue the publication of preprints on our preprint server as of 1 March 2024. The publication culture within mathematics has changed so much due to the rise of repositories such as ArXiV (www.arxiv.org) that we are encouraging all institute members to make their preprints available there. An institute's repository in its previous form is, therefore, unnecessary. The preprints published to date will remain available here, but we will not add any new preprints here.

MiS Preprint
52/2014

The Tits alternative for non-spherical triangles of groups

Johannes Cuno and Jörg Lehnert

Abstract

Triangles of groups have been introduced by Gersten and Stallings. They are, roughly speaking, a generalisation of the amalgamated free product of two groups and occur in the framework of Corson diagrams. First, we prove an intersection theorem for Corson diagrams. Then, we focus on triangles of groups. It has been shown by Howie and Kopteva that the colimit of a hyperbolic triangle of groups contains a non-abelian free subgroup. We give two natural conditions, each of which ensures that the colimit of a non-spherical triangle of groups either contains a non-abelian free subgroup or is virtually solvable.

Received:
May 14, 2014
Published:
May 14, 2014
MSC Codes:
20E06, 20F05, 20F65, 20E05, 20E07
Keywords:
Tits alternative, triangles of groups, disc pictures, metric simplicial complexes, non-positive curvature

Related publications

inJournal
2015 Journal Open Access
Johannes Cuno and Jörg Lehnert

The Tits alternative for non-spherical triangles of groups

In: Transactions of the London Mathematical Society, 2 (2015) 1, pp. 93-124