Keywords. Mapping class group, surface, curve complex, group presentation
AMS subject classification. Primary: 20F05,20F34,57M05. Secondary: 20F38,57M60.
Submitted to GT on 7 January 1999. (Revised 18 November 1999.) Paper accepted 6 December 1999. Paper published 17 December 1999.
Department of Mathematics
Technion, 32000 Haifa, Israel
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