Mathematics – Geometric Topology
Scientific paper
2009-07-06
Algebr. Geom. Topol. 6 (2006) 2313-2350
Mathematics
Geometric Topology
This is the version published by Algebraic & Geometric Topology on 8 December 2006
Scientific paper
10.2140/agt.2006.6.2313
It has been conjectured that the algebraic crossing number of a link is uniquely determined in minimal braid representation. This conjecture is true for many classes of knots and links. The Morton-Franks-Williams inequality gives a lower bound for braid index. And sharpness of the inequality on a knot type implies the truth of the conjecture for the knot type. We prove that there are infinitely many examples of knots and links for which the inequality is not sharp but the conjecture is still true. We also show that if the conjecture is true for K and L, then it is also true for the (p,q)-cable of K and for the connect sum of K and L.
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