arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.1372math.MGmath.GT
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粗几何的组合方法

A combinatorial approach to coarse geometry

M. Cencelj, J. Dydak, A. Vavpeti\v\{c}, \v\{Z}. Virk

摘要:

利用形论的思想,我们将度量空间的粗范畴嵌入到具有单纯键映射的单纯复形的直序列范畴中。两个单纯复形的直列是等价的,如果其中一个可以通过键映射的连续分解和取无限连续变换而转化为另一个。这种嵌入可以通过Rips复形或Roe空间的反\v \{C}ech近似来实现。在该模型中,渐近维数至多为n意味着对于每个k都有m > k,使得从K_k到K_m的键合映射通过一个n维复合体分解(直到邻接)。可以给出G. Yu的性质A的类似表征。使用我们的方法,我们给出了一个简单的证明的表征测地空间,粗略等价于单纯树(藤原和怀特的结果)。

英文摘要:

Using ideas from shape theory we embed the coarse category of metric spaces into the category of direct sequences of simplicial complexes with bonding maps being simplicial. Two direct sequences of simplicial complexes are equivalent if one of them can be transformed to the other by contiguous factorizations of bonding maps and by taking infinite subsequences. That embedding can be realized by either Rips complexes or analogs of Roe's anti-\v\{C}ech approximations of spaces. In that model the asymptotic dimension being at most n means that for each k there is m > k such that the bonding map from K_k to K_m factors (up to contiguity) through an n-dimensional complex. One can give a similar characterization of Property A of G.Yu. Using our approach we give a simple proof of a characterization of geodesic spaces that are coarsely equivalent to simplicial trees (a result of Fujiwara and Whyte).

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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