Keywords. Whitehead double, loop filtration, Goussarov-Habiro, clovers, claspers, Kontsevich integral
AMS subject classification. Primary: 57N10. Secondary: 57M25.
Submitted: 27 March 2001. (Revised: 27 September 2004.) Accepted: 28 September 2004. Published: 13 October 2004.
School of Mathemtaics, Georgia Institute of Technology
Atlanta, GA 30332-0160, USA.
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