Full paper in PDF:
$%Y. Nakanishi, Unknotting number and knot diagram, Rev. Mat. Univ. Complut. Madrid 9 (1996),
no. 2, 359–366.%$
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.