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Showing 1 to 2 of 2 for “"crossing change"”.
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On Nullification of Knots and Links
… the topological properties of a type of local crossing change on oriented knots and links called nullification.</p> <p>One can define a distance between types of knots and links based on the minimum number of nullification moves necessary to change one to the other. Nullification distances form …
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The untwisting number of a knot
… number of a knot is the minimum number of crossings one must change to turn that knot into the unknot. The algebraic unknotting number is the minimum number of crossing changes needed to transform a knot into an Alexander polynomial-one knot. We work with a generalization of unknotting …