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arXiv 0906.4308math.DS
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比较不同版本的平铺上同调

Comparing different versions of tiling cohomology

Housem Boulmezaoud, Johannes Kellendonk

摘要:

我们建立直接同构之间的不同版本的平铺上同调。第一个版本是Anderson-Putnam-Gähler复形中逼近子的上同调的直接极限,第二个版本是最近引入的Bellissard和Savinien的PV-上同调,第三个版本是模式等变上同调。对于后两个版本,可以定义弱上同调群。我们证明了同构扩展到弱版本。这导致了一种替代配方的模式等变混合商群,它描述了变形的平铺模拓扑共轭。

英文摘要:

We establish direct isomorphisms between different versions of tiling cohomology. The first version is the direct limit of the cohomologies of the approximants in the Anderson-Putnam-Gähler complex, the second is the recently introduced PV-cohomolgy of Bellissard and Savinien and the third is pattern equivariant cohomology. For the last two versions one can define weak cohomology groups. We show that the isomorphisms extend to the weak versions. This leads to an alternative formulation of the pattern equivariant mixed quotient group which describes deformations of the tiling modulo topological conjugacy.

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