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$%Y. Nakanishi, Unknotting number and knot diagram, Rev. Mat. Univ. Complut. Madrid 9 (1996), no. 2, 359366.%$

Unknotting Number and Knot Diagram
Yasutaka NAKANISHI
Department of Mathematics
Kobe University
Nad-ku, Kobe 657 Japan

Received: March 16, 1995
 
ABSTRACT

This note is a continuation of a former paper, where we have discussed the unknotting number of knots with respect to knot diagrams. We will show that for every minimum-crossing knot-diagram among all unknotting-number-one two-bridge knot there exist crossings whose exchange yields the trivial knot, if the third Tait conjecture is true.

1991 Mathematics Subject Classification: 57M25.