Three-page embeddings of singular knots
V. Kurlin, V. Vershinin
math.GTarXiv:math/0309325
Abstract
Construction of a semigroup with 15 generators and 84 relations is given. The center of this semigroup is in one-to-one correspondence with the set of all isotopy classes of non-oriented singular knots (links with finitely many double intersections in general position) in three-dimensional space.
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