Three-page embeddings of singular knots

V. Kurlin, V. Vershinin

Published 2003-09-19, updated 2003-09-20Version 2

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.