Author： Kurlin V. A. Vershinin V. V.
Publisher： Springer Publishing Company
ISSN： 0016-2663
Source： Functional Analysis and Its Applications, Vol.38, Iss.1, 2004-01, pp. : 14-27
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Abstract
A semigroup with 15 generators and 84 relations is constructed. The center of the semigroup is in a one-to-one correspondence with the set of all isotopy classes of nonoriented singular knots (links with finitely many double intersections in general position) in
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