J4

• 数学 • 上一篇    下一篇

交错环链补中不可压缩曲面的性质

韩友发, 赵 岩, 杨盛武   

  1. 辽宁师范大学 数学学院, 大连 116029
  • 收稿日期:2004-03-23 修回日期:1900-01-01 出版日期:2005-01-26 发布日期:2005-01-20
  • 通讯作者: 韩友发

Properties of Incompressible Surfacesin Alternating Link Complements

HAN You-fa, ZHAO Yan, YANG Sheng-wu   

  1. Department of Mathematics, College of Mathematics, Liaoning Normal University, Dalian 116029, China
  • Received:2004-03-23 Revised:1900-01-01 Online:2005-01-26 Published:2005-01-20
  • Contact: HAN You-fa

摘要: 设L是S3中的一个交错环链, 将L投影到S2上, L的每个交叉点都对应一个bubble, 用来体现L的交叉点性质. 如果L有n个交叉点, 则投 影图就有n个bubble与之对应, 从而在S3中构造了2个二维球面S2+和S2-. 设F是S3-L中的不可压缩、 分段不可压缩曲面, 并且处于一般位置, 则F∩S2±是一组简单闭曲线. 通过讨论F∩S2±的 性质刻画了曲面的性质. 当F∩S2±的图(也称为拓扑图)是特殊简单的, 则曲面F的亏格是零.

关键词: 交错环链, 亏格, 不可压缩曲面

Abstract: Let L be an alternating link in S3 and let L project on S2 except near crossings of L where L lies on a bubble. If the projective diagram on S2 has n crossings, then there are n bubbles. Thus are construced 2-spheres surfaces S2+ and S2- by the properties of the link. Let F be an incompressible and pairwise incompressible surface in S3-L, there is a collection of simple closed curves when the surface F is in a standard position. The surfaces are described by discussing the properties of F∩S2±. The genus of the surface equals zero if the graph of F∩S2± is special simple.

Key words: alternating link, genus, incompressible surface

中图分类号: 

  • O189.3