Keywords. Concordance, Seifert matrix, Alexander polynomial
AMS subject classification. Primary: 57M25. Secondary: 57N70.
Submitted to GT on 21 August 2001. (Revised 21 April 2002.) Paper accepted 22 August 2002. Paper published 5 September 2002.
Department of Mathematics, Indiana University
Bloomington, IN 47405, USA
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