CSA groups and separated free constructions

Details CSA groups and separated free constructions CSA groups and separated free constructions

1996-05-13

arxiv.org/abs/math/9605203v1

Mathematics

Group Theory

LaTex file, 26 pages. Not avilable

Scientific paper

A group $G$ is said to be a {\it CSA}-group if all maximal abelian subgroups of $G$ are malnormal. The class of CSA groups is of interest because it contains torsion-free hyperbolic groups, groups acting freely on $\Lambda$-trees and groups with the same existential theory as free groups. CSA groups are also very closely related to the study of residually free groups and tensor completions. In this paper we investigate which free constructions (amalgamated products and HNN extensions) over CSA groups are again CSA. The results are applied, in particular, to show that a torsion-free one-relator group is CSA if and only if it does not contain nonabelian metabelin Baumslag-Solitar groups and the direct product of the free group of rank 2 and the infinite cyclic group.

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