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arXiv 1111.2866math.ATmath.GT
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复环面超平面补的上同调的消失结果

Vanishing results for the cohomology of complex toric hyperplane complements

M. W. Davis, S. Settepanella

摘要:

假设$\Cal R$是复环面$(\C^*)^n$和$π=π_1(\Cal R)$中复环面超通道的基本排列的补充。我们发现,$H^*(\Cal R;A)$消失,除了在最高程度$n$时,$A$是以下系统的局部系数之一:(a)系统的非共振系数在一个复杂的线丛,(b)冯诺依曼代数$\cnπ$,或(c)组环$\zz π$。在情况(a)中,$H^n$的维数是$|e(\Cal R)|$,其中$e(\Cal R)$表示欧拉特征,并且在情况(b)中,$n^{\mathrm{th}}$ $\eltwo$ Betti数也是$|e(\Cal R)|$。

英文摘要:

Suppose $\Cal R$ is the complement of an essential arrangement of toric hyperlanes in the complex torus $(\C^*)^n$ and $π=π_1(\Cal R)$. We show that $H^*(\Cal R;A)$ vanishes except in the top degree $n$ when $A$ is one of the following systems of local coefficients: (a) a system of nonresonant coefficients in a complex line bundle, (b) the von Neumann algebra $\cnπ$, or (c) the group ring $\zz π$. In case (a) the dimension of $H^n$ is $|e(\Cal R)|$ where $e(\Cal R)$ denotes the Euler characteristic, and in case (b) the $n^{\mathrm{th}}$ $\eltwo$ Betti number is also $|e(\Cal R)|$.

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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