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Companions of the unknot and width additivity
Journal article   Peer reviewed

Companions of the unknot and width additivity

Ryan Blair and Maggy Tomova
Journal of knot theory and its ramifications, Vol.20(4), pp.497-511
2011
DOI: 10.1142/S0218216511009352

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Abstract

It has been conjectured that for knots K and K′ in S 3 , w(K # K′) = w(K) + w(K′) - 2. In [7], Scharlemann and Thompson proposed potential counterexamples to this conjecture. For every n, they proposed a family of knots [Formula: see text] for which they conjectured that [Formula: see text] where B n is a bridge number n knot. We show that for n > 2 none of the knots in [Formula: see text] produces such counterexamples.

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