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arXiv 2005.12539math.AGmath.AT
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刚性化扭转子余循环、超覆盖与丛格布

Rigidified torsor cocycles, hypercoverings and bundle gerbes

Stefan Schröer

AI总结:

本文通过引入刚性化扭转子,为高维层上同调提供了几何解释,推广了低维情形,并揭示了与丛格布的联系。

摘要:

我们给出了高维数 n 的层上同调的几何解释,即通过类型 r=n-2 的超覆盖中维度 d=n-1 的元素上的扭转子,并赋予附加数据,即所谓的刚性化。这推广了以下事实:一维上同调是扭转子的同构类群,其中刚性化变得空洞;二维上同调可以用丛格布表示,其中刚性化变为结合性约束。

英文摘要:

We give a geometric interpretation of sheaf cohomology for higher degrees n in terms of torsors on the member of degree d=n-1 in hypercoverings of type r=n-2, endowed with an additional data, the so-called rigidification. This generalizes the fact that cohomology in degree one is the group of isomorphism classes of torsors, where the rigidification becomes vacuous, and that cohomology in degree two can be expressed in terms of bundle gerbes, where the rigidification becomes an associativity constraint.

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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