Mathematics – Group Theory
Scientific paper
2009-06-05
Algebraic and Geometric Topology 9 (2009) 1971-1986
Mathematics
Group Theory
v2 final version incorporating referee's comments
Scientific paper
10.2140/agt.2009.9.1971
The intersection pattern of the translates of the limit set of a quasi-convex subgroup of a hyperbolic group can be coded in a natural incidence graph, which suggests connections with the splittings of the ambient group. A similar incidence graph exists for any subgroup of a group. We show that the disconnectedness of this graph for codimension one subgroups leads to splittings. We also reprove some results of Peter Kropholler on splittings of groups over malnormal subgroups and variants of them.
Mj Mahan
Scott Peter
Swarup Gadde
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