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arXiv 1902.07044math.AT
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测地空间的幅度同调

Magnitude homology of geodesic space

Department of Mathematics, Institute of Science Tokyo(东京科学大学数学系)

Kiyonori Gomi

AI总结:

该文研究测地度量空间的幅度同调群,借助单纯复形给出二、三阶幅度同调的刻画,引入三阶同调类的相交数不变量,并完整刻画满足非分支假设的测地空间的全部幅度同调群。

摘要:

本文研究测地度量空间的幅度同调群。我们首先借助某类单纯复形的零阶同调群,给出一般度量空间二阶幅度同调的一种刻画。随后在测地度量空间上,我们通过测地线来解读该刻画。测地度量空间的三阶幅度同调也可通过单纯复形进行刻画。在对度量空间的一项假设下,该单纯刻画使我们能够引入三阶幅度同调类的一个不变量,即相交数。最后,我们对满足某类非分支假设的测地度量空间的所有幅度同调群给出了完整刻画。

英文摘要:

This paper studies the magnitude homology groups of geodesic metric spaces. We start with a description of the second magnitude homology of a general metric space in terms of the zeroth homology groups of certain simplicial complexes. Then, on a geodesic metric space, we interpret the description by means of geodesics. The third magnitude homology of a geodesic metric space also admits a description in terms of a simplicial complex. Under an assumption on a metric space, the simplicial description allows us to introduce an invariant of third magnitude homology classes as an intersection number. Finally, we provide a complete description of all the magnitude homology groups of a geodesic metric space which fulfils a certain non-branching assumption.

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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