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On Heegaard splittings of knot exteriors with tunnel number degenerations

机译:关于隧道数退化的结外表面的Heegaard分裂

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摘要

Let K-1, K-2 be two knots with t(K-1) + t(K-2) > 2 and t(K-1#K-2) = 2. Then, in the present paper, we will show that any genus three Heegaard splitting of E(K-1#K-2) is strongly irreducible and that E(Ki#K2) has at most four genus three Heegaard splittings up to homeomorphism. Moreover, we will give a complete classification of those four genus three Heegaard splittings and describe unknotting tunnel systems of knots K-1#K-2 corresponding to those Heegaard splittings. (C) 2015 Elsevier B.V. All rights reserved.
机译:令K-1,K-2为两个结,t(K-1)+ t(K-2)> 2且t(K-1#K-2)=2。然后,在本文中,我们将证明E(K-1#K-2)的任何三个属Heegaard分裂都是不可约的,并且E(Ki#K2)最多具有四个Heegaard分裂的四个属直到同胚。此外,我们将对这四个属三个Heegaard分裂给出完整的分类,并描述对应于这些Heegaard分裂的结K-1#K-2的不打结隧道系统。 (C)2015 Elsevier B.V.保留所有权利。

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