Keywords. Two bridge knots, unknotting tunnel
AMS subject classification. Primary: 57M25. Secondary: 57M05.
Submitted: 28 December 1998. (Revised: 30 May 1999.) Published: 20 November 1999.
Department of Mathematics, Nara Women's University
Kita-Uoya Nishimachi, Nara 630, JAPAN
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