Keywords. Braid, root, conjugacy, Nielsen-Thurston theory.
AMS subject classification. Primary: 20F36. Secondary: 20F65..
Submitted: 29 June 2003. (Revised: 16 October 2003.) Accepted: 20 October 2003. Published: 1 November 2003.
Universidad de Sevilla. Dep. Matematica Aplicada I
ETS Arquitectura, Av. Reina Mercedes 2, 41012-Sevilla, Spain
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