In this paper we obtain an isoperimetric characterization of relatively hyperbolicity of a groups with respect to a collection of subgroups. This allows us to apply classical combinatorial methods related to van Kampen diagrams to obtain relative analogues of some well-known algebraic and geometric properties of ordinary hyperbolic groups. We also introduce and study the notion of a relatively quasi-convex subgroup of a relatively hyperbolic group and solve some natural algorithmic problems.
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978-0-8218-3821-1 (9780821838211)
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Schweitzer Klassifikation
Introduction Relative isoperimetric inequalities Geometry of finitely generated relatively hyperbolic groups Algebraic properties Algorithmic problems Open questions Appendix. Equivalent definitions of relative hyperbolicity Bibliography.
