Keywords. Thurston norm, Alexander norm, multivariable Alexander polynomial, fibred links, positive braids, Bennequin's inequality, Bennequin surface, Morton's conjecture
AMS subject classification. Primary: 57M25. Secondary: 57M27, 57M50.
Submitted: 14 December 2000. (Revised: 21 May 2001.) Accepted: 25 May 2001. Published: 31 May 2001.
Oliver T. Dasbach, Brian S. Mangum
University of California, Riverside, Department of Mathematics
Riverside, CA 92521 - 0135, USA
Barnard College/Columbia University, Department of Mathematics
New York, NY 10027, USA
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