Article,

Inequivalent surface-knots with the same knot quandle

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Topology and its Applications, 154 (15): 2757--2763 (2007)
DOI: 10.1016/j.topol.2007.05.010

Abstract

We have a knot quandle and a fundamental class as invariants for a surface-knot. These invariants can be defined for a classical knot in a similar way, and it is known that the pair of them is a complete invariant for classical knots. In surface-knot theory the situation is different: There exist arbitrarily many inequivalent surface-knots of genus g with the same knot quandle, and there exist two inequivalent surface-knots of genus g with the same knot quandle and with the same fundamental class.

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