A PRESENTATION FOR THE AUTOMORPHISMS OF THE 3-SPHERE THAT PRESERVE A GENUS TWO HEEGAARD SPLITTING

A PRESENTATION FOR THE AUTOMORPHISMS OF THE 3-SPHERE THAT PRESERVE A GENUS TWO HEEGAARD SPLITTING
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保留属二 Heegaard 分裂的 3 球自同构的介绍

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发表时间:
2005
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通讯作者:
Erol Akbas
Erol Akbas
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作者:
Erol Akbas

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Scharlemann 通过群体 ${mathcal H_{2}}$ 的作用构造了一个连通单纯形 2-复形 $Gamma$,该群 ${mathcal H_{2}}$ 具有保持 $S^3$ 方向同胚的同位素类,该同位素类保留了无结 2 属手柄 $V$ 的同位素类。在本文中,我们证明了 2 复形 $Gamma$ 是可收缩的。因此我们得到 ${mathcal H_{2}}$ 的有限表示。
Scharlemann constructed a connected simplicial 2-complex $Gamma$ with an action by the group ${mathcal H_{2}}$ of isotopy classes of orientation preserving homeomorphisms of $S^3$ that preserve the isotopy class of an unknotted genus 2 handlebody $V$. In this paper we prove that the 2-complex $Gamma$ is contractible. Therefore we get a finite presentation of ${mathcal H_{2}}$.