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 Date: 2008-11-13 12:35:42Geometry Mathematics Combinatorics on words Metric geometry Geometric group theory Hyperbolic geometry -hyperbolic space Geodesic Hyperbolic group HNN extension Quasi-isometry Differential geometry of surfaces |
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A CHARACTERISATION OF VIRTUALLY FREE GROUPS ROBERT H. GILMAN, SUSAN HERMILLER, DEREK F. HOLT, AND SARAH REES Abstract. We prove that a finitely generated group G is virtually free if and only if there exists a generating