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arXiv 0910.5262math.GTmath.AT
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从群同调观点看拉格朗日映射类群

Lagrangian mapping class groups from a group homological point of view

Takuya Sakasai

摘要:

本文主要研究了与曲面的第一同调的拉格朗日子模有关的曲面的映射类群的两类无穷指数子群。这些子群被称为拉格朗日映射类群,在映射类群与三维流形的有限型不变量之间的相互作用中起着重要的作用。本文从群(余)同调的角度讨论了这类群。这些结果包括确定它们的阿贝尔化、二阶同调的下界以及对高次同调的注记。作为本研究的一个副产品,我们确定了亏格为3的曲面的映射类群的第二同调。

英文摘要:

We focus on two kinds of infinite index subgroups of the mapping class group of a surface associated with a Lagrangian submodule of the first homology of a surface. These subgroups, called Lagrangian mapping class groups, are known to play important roles in the interaction between the mapping class group and finite-type invariants of 3-manifolds. In this paper, we discuss these groups from a group (co)homological point of view. The results include the determination of their abelianizations, lower bounds of the second homology and remarks on the (co)homology of higher degrees. As a by-product of this investigation, we determine the second homology of the mapping class group of a surface of genus 3.

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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