Keywords. Quandles, racks, cocycle knot invariants, knot colorings.
AMS subject classification. Primary: 57M25, 57Q45. Secondary: 55N99, 18G99.
Submitted to GT on 30 November 2001. (Revised 12 February 2002.) Paper accepted 22 July 2002. Paper published 28 July 2002.
Dept. of Math., Hiroshima University, Hiroshima 739-8526, JAPAN
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