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arXiv 1009.2134math.GT
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1-亏格1-桥纽结外部的亏格2 Heegaard分裂

Genus two Heegaard splittings of exteriors of 1-genus 1-bridge knots

Hiroshi Goda, Chuichiro Hayashi

摘要:

闭连通可定向3-流形M中的纽结K称为1-亏格1-桥纽结,如果(M,K)分裂为两对实心环面Vi(i= 1,2)和边界平行弧,这种分裂自然地导致K的外部的亏格2 Heegaard分裂,即,K有一个不打结的隧道。然而,一般情况下,反过来并不正确。本文对这类一般情况进行了研究。其中一个结论是,解开隧道可能与圆环\partial V_1= \partial V_2齐平。

英文摘要:

A knot K in a closed connected orientable 3-manifold M is called a 1-genus 1-bridge knot if (M,K) has a splitting into two pairs of a solid torus V_i (i=1,2) and a boundary parallel arc in it. The splitting induces a genus two Heegaard splitting of the exterior of K naturally, i.e., K has an unknotting tunnel. However the converse is not true in general. Then we study such general case in this paper. One of the conclusions is that the unknotting tunnel may be levelled with the torus \partial V_1=\partial V_2.

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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