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DELTA-UNKNOTTING NUMBER FOR KNOTS

1998; World Scientific; Volume: 07; Issue: 05 Linguagem: Inglês

10.1142/s0218216598000334

1793-6527

Kazuaki Nakamura, Yasutaka Nakanishi, Yoshiaki Uchida,

Logic, programming, and type systems

The Δ-unknotting number for a knot is defined to be the minimum number of Δ-unknotting operations which deform the knot into the trivial knot. We determine the Δ-unknotting numbers for torus knots, positive pretzel knots, and positive closed 3-braids.