Keywords. Word hyperbolic groups, residual finiteness, engulfing
AMS subject classification. Primary: 20E26. Secondary: 20F67, 20F65.
Submitted: 17 May 2002. Accepted: 8 July 2002. Published: 9 September 2002.
G. A. Niblo, B. T. Williams
Faculty of Mathematical Studies, University of Southampton,
Highfield, Southampton SO17 1BJ, UK
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