On knots having zero negative unknotting number
Yuanyuan Bao
57M2757M25negative unknotting numberDehn surgeryOzsv{\\\'a}th and Szab{\\\'o}\'s $d$-invariant
A knot in the 3-sphere is said to have zero negative unknotting number if it can be transformed into the unknot by performing only positive crossing changes. In this paper, we provide an obstruction to a knot's having zero negative unknotting number, and discuss its application to two classes of knots.
Indiana University Mathematics Journal
2014
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10.1512/iumj.2014.63.5223
10.1512/iumj.2014.63.5223
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Indiana Univ. Math. J. 63 (2014) 597 - 613
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