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arXiv 1507.00699math.GT
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L-空间和无意义交叉的美容手术

Cosmetic surgery in L-spaces and nugatory crossings

Tye Lidman, Allison H. Moore

摘要:

化妆品交叉猜想(也称为“nugatural crossing concerning”)断言,在3-sphere中唯一保持纽结的定向合痕类的交叉变化是nugatural的。我们利用Dehn手术刻画的unknot证明了这个猜想的纽结在整数同调球面,其分支双覆盖是L-空间满足一个同调条件。这包括作为特殊情况的所有交替和准交替纽结与平方自由行列式。作为应用,我们证明了化妆品交叉猜想持有最多9个交叉点的所有节点,并提供了新的例子的结,包括椒盐卷饼结,非树状结和对称工会的猜想持有。

英文摘要:

The cosmetic crossing conjecture (also known as the "nugatory crossing conjecture") asserts that the only crossing changes that preserve the oriented isotopy class of a knot in the 3-sphere are nugatory. We use the Dehn surgery characterization of the unknot to prove this conjecture for knots in integer homology spheres whose branched double covers are L-spaces satisfying a homological condition. This includes as a special case all alternating and quasi-alternating knots with square-free determinant. As an application, we prove the cosmetic crossing conjecture holds for all knots with at most nine crossings and provide new examples of knots, including pretzel knots, non-arborescent knots and symmetric unions for which the conjecture holds.

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