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arXiv 1807.10071math.GT
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约束链接和奇异链接的不变量

Tied links and invariants for singular links

Francesca Aicardi, Jesus Juyumaya

摘要:

作者最近引入了系链和系辫幺半群,并用于定义经典链的新不变量。在这里,我们给出了一个版本纯粹的代数组合的捆绑链接。利用这个新的形式,我们证明了系辫么半群具有半直积的分解。利用这种分解,我们重新证明了束缚环的Alexander和Markov定理,并引入了束缚奇异结、束缚奇异辫幺半群和束缚奇异环的Homflypt型不变量族,这些不变量是五元多项式.最后,我们研究这些不变量的行为,特别是,我们表明,我们的不变量区分非同位素奇异链接不可区分的巴黎-拉本达不变量。

英文摘要:

Tied links and the tied braid monoid were introduced recently by the authors and used to define new invariants for classical links. Here, we give a version purely algebraic-combinatoric of tied links. With this new version we prove that the tied braid monoid has a decomposition like a semi--direct group product. By using this decomposition we reprove the Alexander and Markov theorem for tied links; also, we introduce the tied singular knots, the tied singular braid monoid and certain families of Homflypt type invariants for tied singular links; these invariants are five-variables polynomials. Finally, we study the behavior of these invariants; in particular, we show that our invariants distinguish non isotopic singular links indistinguishable by the Paris-Rabenda invariant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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