Keywords. Divide, graph divide, quasipositive link, slice Euler characteristic, four-dimensional clasp number
AMS subject classification. Primary: 57M25. Secondary: 57M27.
Submitted: 2 January 2003. (Revised: 1 June 2004.) Accepted: 5 June 2004. Published: 8 August 2004.
Department of Physics and Mathematics, Aoyama Gakuin University
5-10-1, Fuchinobe Sagamihara, Kanagawa 229-8558, Japan
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