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arXiv 0911.3014math.AT
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关于有限群的负Tate上同调积

On the Product in Negative Tate Cohomology for Finite Groups

Haggai Tene

摘要:

本文给出整系数有限群的Tate上同调负次数上积的几何刻划。通过对偶,它对应于$BG$的积分同调中的乘积:{ \[H_{n}(BG,\mathbb{Z})\otimes H_{m}(BG,\mathbb{Z})\rightarrow H_{n+m+1}(BG,\mathbb{Z})\] }对于$n,m>0$。我们将这种产品描述为环的连接,这解释了维度的变化。我们的动机来自Kreck使用层状同源性定义的产物。证明了对于有限群,负Tate上同调的上积与Kreck积重合. Kreck积也适用于$G$是紧致李群(具有额外的维度位移)的情况。

英文摘要:

Our aim in this paper is to give a geometric description of the cup product in negative degrees of Tate cohomology of a finite group with integral coefficients. By duality it corresponds to a product in the integral homology of $BG$: {\[H_{n}(BG,\mathbb{Z})\otimes H_{m}(BG,\mathbb{Z})\rightarrow H_{n+m+1}(BG,\mathbb{Z})\]} for $n,m>0$. We describe this product as join of cycles, which explains the shift in dimensions. Our motivation came from the product defined by Kreck using stratifold homology. We then prove that for finite groups the cup product in negative Tate cohomology and the Kreck product coincide. The Kreck product also applies to the case where $G$ is a compact Lie group (with an additional dimension shift).

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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