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arXiv 1005.0073math.GTmath.CO
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2-曲面的双裤分解

Double pants decompositions of 2-surfaces

Anna Felikson, Sergey Natanzon

摘要:

我们考虑任何亏格g的同一可定向二维曲面的两个裤子分解的并。每一个裤子分解对应于这个曲面所包围的某个拟物体,所以两个裤子分解对应于一个3-流形的Heegaard分裂。我们引入一个作用于双裤分解的广群FT。这个广群由两个简单的变换(称为翻转和手柄扭曲)生成,每个变换只影响双裤分解的一条曲线。我们证明了FT作用于所有对应于Heegaard分裂的3维球面的double pants分解的传递性。作为推论,映射类群包含在FT中。

英文摘要:

We consider a union of two pants decompositions of the same orientable 2-dimensional surface of any genus g. Each pants decomposition corresponds to some handlebody bounded by this surface, so two pants decompositions correspond to a Heegaard splitting of a 3-manifold. We introduce a groupoid FT acting on double pants decompositions. This groupoid is generated by two simple transformations (called flips and handle twists), each transformation affecting only one curve of the double pants decomposition. We prove that FT acts transitively on all double pants decompositions corresponding to Heegaard splittings of a 3-dimensional sphere. As a corollary, the mapping class group is contained in FT.

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