arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.4485math.GT
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纽结的多重交叉数与Kauffman多项式

Multi-crossing Number for Knots and the Kauffman Bracket Polynomial

Colin Adams, Orsola Capovilla-Searle, Jesse Freeman, Daniel Irvine, Samantha Petti, Daniel Vitek, Ashley Weber, Sicong Zhang

摘要:

多交叉(或n交叉)是投影中的奇点,在该点处n条链交叉,使得每条链平分交叉。我们将Kauffman,Murasugi和Thistlethwaite的经典结果推广到n-交叉数:对于所有不小于3的整数n,k的括号多项式的跨度的上<K>界为([n^2/2] +4 n-8)c_n(K).我们还探讨了n-交叉的可加性下的组合,并发现,对于n至少为4,有这样的节点的例子,使n-交叉数是次加性。此外,我们提出了第一个广泛的列表计算的n-交叉数的结。最后,我们探讨的单调性序列的n-交叉的一个结,我们称之为交叉谱。

英文摘要:

A multi-crossing (or n-crossing) is a singular point in a projection at which n strands cross so that each strand bisects the crossing. We generalize the classic result of Kauffman, Murasugi, and Thistlethwaite, which gives the upper bound on the span of the bracket polynomial of K as 4c_2(K), to the n-crossing number: span<K> is bounded above by ([n^2/2] + 4n-8) c_n(K) for all integers n at least 3. We also explore n-crossing additivity under composition, and find that for n at least 4, there are examples of knots such that the n-crossing number is sub-additive. Further, we present the first extensive list of calculations of n-crossing numbers for knots. Finally, we explore the monotonicity of the sequence of n-crossings of a knot, which we call the crossing spectrum.

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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