...
【24h】

On Krebes's tangle

机译:克雷伯斯的纠结

获取原文
获取原文并翻译 | 示例
           

摘要

A genus-1 tangle (g) is an arc properly embedded in a standardly embedded solid torus S in the 3-sphere. We say that a genus-1 tangle embeds in a knot K (∈) S~3 if the tangle can be completed by adding an arc exterior to the solid torus to form the knot K. We call K a closure of (g). An obstruction to embedding a genus-1 tangle (g) in a knot is given by torsion in the homology of branched covers of S branched over (g). We examine a particular example A of a genus-1 tangle, given by Krebes, and consider its two double-branched covers. Using this homological obstruction, we show that any closure of A obtained via an arc which passes through the hole of S an odd number of times must have determinant divisible by three. A resulting corollary is that if A embeds in the unknot, then the arc which completes A to the unknot must pass through the hole of S an even number of times.
机译:属1缠结(g)是正确嵌入3球体中标准嵌入的实心圆环S中的弧。我们说,如果可以通过在实心圆环外部添加弧形以形成结K来完成缠结,则在缠结K(∈)S〜3中嵌入一个属1的缠结。我们称K为(g)的闭包。在第(g)分支的S的分支分支的同源性中,通过扭转产生了将第1类纠缠(g)嵌入到结中的障碍。我们研究了Krebes给出的一个属1纠缠的特殊示例A,并考虑了它的两个双分支覆盖。使用这种同源性障碍,我们表明,通过弧形以奇数次穿过S孔的弧获得的A的任何闭合,都必须具有行列式可被三整除。由此产生的必然结果是,如果将A嵌入到小节中,则完成A到小节的弧必须穿过S的孔数次。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号