Hyperbolic Graphs of Surface Groups

Details Hyperbolic Graphs of Surface Groups Hyperbolic Graphs of Surface Groups

2008-01-24

arxiv.org/abs/0801.3696v2

Mathematics

Group Theory

52 pages, 7 figures, thesis draft

Scientific paper

We give a sufficient condition under which the fundamental group of a reglued graph of surfaces is hyperbolic. A reglued graph of surfaces is constructed by cutting a fixed graph of surfaces along the edge surfaces, then regluing by pseudo-Anosov homeomorphisms of the edge surfaces. By carefully choosing the regluing homeomorphism, we construct an example of such a reglued graph of surfaces, whose fundamental group is not abstractly commensurate to any surface-by-free group, i.e., which is different from all the examples given in Mosher's paper 'A hyperbolic-by-hyperbolic hyperbolic group'.

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