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arXiv math/0605725math.GTmath.KT
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平凡余圈与同调3-球面的不变量

Trivial Cocycles and Invariants of Homology 3-Spheres

Wolfgang Pitsch

摘要:

研究了Torelli群上的平凡上圈与定向整同调3-球面不变量之间的关系。给出定义在Torelli群并上的函数是同调球面不变量的充要条件充分条件。我们应用这项研究给出了一个新的纯代数的卡森不变量的建设,并证明在此设置其手术性质。作为副产品,我们得到了Torelli群的第二整上同调中的一个新的2-挠上同调类。

英文摘要:

We study the relationship between trivial cocycles on the Torelli group and invariants of oriented integral homology 3-spheres. We give ncecessary and sufficient conditions for a function defined on the union of the Torelli groups to be an invariant of homology spheres. We apply this study to give a new purely algebraic construction of the Casson invariant and prove in this setting its surgery properties. As a by-product we get a new 2-torsion cohomology class in the second integral cohomology of the Torelli group.

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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