Document Type

Article

Publication Date

2015

Abstract

Every classical or virtual knot is equivalent to the unknot via a sequence of extended Reidemeister moves and the so-called forbidden moves. The minimum number of forbidden moves necessary to unknot a given knot is an invariant we call the forbid- den number. We relate the forbidden number to several known invariants, and calculate bounds for some classes of virtual knots.

Original Publication Citation

Crans, A., B. Mellor, and S. Ganzell, 2015: The forbidden number of a knot. Kyungpook Mathematical Journal, 55.2, 485-506, http://dx.doi.org/10.5666/KMJ.2015.55.2.485.

Publisher Statement

Crans, A., B. Mellor, and S. Ganzell, 2015: The forbidden number of a knot. Kyungpook Mathematical Journal, 55.2, 485-506, http://dx.doi.org/10.5666/KMJ.2015.55.2.485. Learn more at http://kmj.knu.ac.kr. Copyright © Department of Mathematics at Kyungpook National University.

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