Keywords. Relatively hyperbolic groups, limit groups, R-trees
AMS subject classification. Primary: 20F65. Secondary: 20F67, 20E08, 57M07.
Submitted to G&T on 15 March 2005. Paper accepted 3 December 2005. Paper published 21 December 2005.
Department of Mathematics, California Institute of Technology
Pasadena, CA 91125, USA
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