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arXiv 2108.00563math.GTmath.CO
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2-桥纽结平均亏格的一个下界

A lower bound on the average genus of a 2-bridge knot

Moshe Cohen

摘要:

Dunfield等人使用随机网格图的实验数据表明,结的亏格相对于交叉数线性增长。利用Koseleff和Pecker提出的Chebyshev结的台球桌图和作者与Krishnan以及Even-Zohar和Krishnan通过这些图提出的2-桥结的随机模型,我们引入了一个进一步截断的模型,该模型包含给定交叉数的所有2-桥结,几乎都计数两次。我们提出了一个方便的方法来计算在这个模型中的塞弗特圈,并使用此计算一个下界的平均塞弗特亏格的2桥结的一个给定的交叉数。

英文摘要:

Experimental data from Dunfield et al using random grid diagrams suggests that the genus of a knot grows linearly with respect to the crossing number. Using billiard table diagrams of Chebyshev knots developed by Koseleff and Pecker and a random model of 2-bridge knots via these diagrams developed by the author with Krishnan and then with Even-Zohar and Krishnan, we introduce a further-truncated model of all 2-bridge knots of a given crossing number, almost all counted twice. We present a convenient way to count Seifert circles in this model and use this to compute a lower bound for the average Seifert genus of a 2-bridge knot of a given crossing number.

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