Magnitude homology of metric spaces and order complexes
Magnitude homology of metric spaces and order complexes
复制标题
度量空间和阶复数的量同调
DOI:
10.1112/blms.12469
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发表时间:
2021
影响因子:
0.9
通讯作者:
Yoshinaga Masahiko
中科院分区:
文献类型:
--
作者:
Kaneta Ryuki;Yoshinaga Masahiko
Hepworth, Willerton, Leinster and Shulman introduced the magnitude homology groups for enriched categories, in particular, for metric spaces. The purpose of this paper is to describe the magnitude homology group of a metric space in terms of order complexes of posets.In a metric space, an interval (the set of points between two chosen points) has a natural poset structure, which is called the interval poset. Under additional assumptions on sizes of 4‐cuts, we show that the magnitude chain complex can be constructed using tensor products, direct sums and degree shifts from order complexes of interval posets.We give several applications. First, we show the vanishing of higher magnitude homology groups for convex subsets of the Euclidean space. Second, magnitude homology groups carry the information about the diameter of a hole. Third, we construct a finite graph whose third magnitude homology group has torsion.
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影响因子:
1.3
作者:
D. Kozlov
通讯作者:
D. Kozlov
影响因子:
0.9
作者:
T. Leinster
通讯作者:
T. Leinster
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Benoît Jubin
通讯作者:
Benoît Jubin
DOI:
10.4310/hha.2017.v19.n2.a3
发表时间:
2015
期刊:
arXiv: Combinatorics
影响因子:
--
作者:
Richard Hepworth;S. Willerton
通讯作者:
S. Willerton
影响因子:
0.7
作者:
T. Leinster;Michael Shulman
通讯作者:
Michael Shulman