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arXiv 0910.5634math.COmath.AT
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关于局部有限图的同调

On the homology of locally finite graphs

Reinhard Diestel, Philipp Sprüssel

摘要:

证明了局部有限图的拓扑循环空间是其Freudenthal紧化的第一个奇异同调群的标准商,并刻画了这两个标准商重合的图.本文构造了一个新的带端点的非紧空间的奇异型同调,它在1维精确地刻画了图的拓扑圈空间,但在任何维都有效。

英文摘要:

We show that the topological cycle space of a locally finite graph is a canonical quotient of the first singular homology group of its Freudenthal compactification, and we characterize the graphs for which the two coincide. We construct a new singular-type homology for non-compact spaces with ends, which in dimension~1 captures precisely the topological cycle space of graphs but works in any dimension.

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