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arXiv 0908.2795math.GT
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纤维结和性能2 R,II

Fibered knots and Property 2R, II

Robert E. Gompf, Martin Scharlemann

摘要:

3-球面中的纽结K被称为具有性质nR,如果,每当K是n-分量链接L的一个分量,并且L上的某个积分运算产生了S^1 x S^2的n个拷贝的连通和时,L上存在一个将L转换为0-框架非链接的手柄滑动序列。广义性质R猜想是所有的纽结对所有的n都具有性质nR。最简单的反例可能是方结。利用正方形纽结的显著对称性,我们刻画了所有包含它的两分量链,它们的激增为S^1 x S^2 # S^1 x S^2。我们认为,至少有一个这样的链接可能无法减少到一系列的unlink的滑动,所以方结可能不具有属性2 R。这个例子是基于第一作者的一个经典结构。另一方面,方纽结可能满足一个稍微弱一些的性质,这在四维流形理论中仍然有用。对于较弱的属性,取消的霍普夫对的副本可以在手柄滑动之前添加到链接中,然后在手柄滑动之后删除。除了我们的具体例子,我们讨论了如何添加和稍后删除的霍普夫对可以用来减少手术描述的复杂性的机制。

英文摘要:

A knot K in the 3-sphere is said to have Property nR if, whenever K is a component of an n-component link L and some integral surgery on L produces the connected sum of n copies of S^1 x S^2, there is a sequence of handle slides on L that converts L into a 0-framed unlink. The Generalized Property R Conjecture is that all knots have Property nR for all n. The simplest plausible counterexample could be the square knot. Exploiting the remarkable symmetry of the square knot, we characterize all two-component links that contain it and which surger to S^1 x S^2 # S^1 x S^2. We argue that at least one such link probably cannot be reduced to the unlink by a series of handle-slides, so the square knot probably does not have Property 2R. This example is based on a classic construction of the first author. On the other hand, the square knot may well satisfy a somewhat weaker property, which is still useful in 4-manifold theory. For the weaker property, copies of canceling Hopf pairs may be added to the link before the handle slides and then removed after the handle slides. Beyond our specific example, we discuss the mechanics of how addition and later removal of a Hopf pair can be used to reduce the complexity of a surgery description.

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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