## On McMullen’s and other inequalities for the Thurston norm of link complements.(English)Zbl 0969.57014

Authors’ abstract: “In a recent paper, McMullen showed an inequality between the Thurston norm and the Alexander norm of a 3-manifold. This generalizes the well-known fact that twice the genus of a knot is bounded from below by the degree of the Alexander polynomial. We extend the Bennequin inequality for links to an inequality for all points of the Thurston norm, if the manifold is a link complement. We compare these two inequalities on two classes of closed braids. In an additional section we discuss a conjectured inequality due to Morton for certain points of the Thurston norm. We prove Morton’s conjecture for closed 3-braids”.

### MSC:

 57M99 General low-dimensional topology 57M25 Knots and links in the $$3$$-sphere (MSC2010) 57M50 General geometric structures on low-dimensional manifolds 57N10 Topology of general $$3$$-manifolds (MSC2010)
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