Magnitude homology and path homology
Magnitude homology and path homology
复制标题
幅度同源性和路径同源性
DOI:
10.1112/blms.12734
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发表时间:
2022
影响因子:
0.9
通讯作者:
Yasuhiko Asao
中科院分区:
文献类型:
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作者:
Yasuhiko Asao
In this article, we show that magnitude homology and path homology are closely related, and we give some applications. We define differentials MHkℓ(G)⟶MHk−1ℓ−1(G)$\operatorname{MH}^{\ell }_k(G) \longrightarrow \operatorname{MH}^{\ell -1}_{k-1}(G)$ between magnitude homologies of a digraph G$G$ , which make them chain complexes. Then we show that its homology MHkℓ(G)$\mathcal {MH}^{\ell }_k(G)$ is non‐trivial and homotopy invariant in the context of ‘homotopy theory of digraphs’ developed by Grigor'yan–Muranov–S.‐T. Yau et al. (G‐M‐Ys in the following). It is remarkable that the diagonal part of our homology MHkk(G)$\mathcal {MH}^{k}_k(G)$ is isomorphic to the reduced path homology H∼k(G)$\tilde{H}_k(G)$ also introduced by G‐M‐Ys. Further, we construct a spectral sequence whose first page is isomorphic to magnitude homology MHkℓ(G)$\operatorname{MH}^{\ell }_k(G)$ , and the second page is isomorphic to our homology MHkℓ(G)$\mathcal {MH}^{\ell }_k(G)$ . As an application, we show that the diagonality of magnitude homology implies triviality of reduced path homology. We also show that H∼k(g)=0$\tilde{H}_k(g) = 0$ for k⩾2$k \geqslant 2$ and H∼1(g)≠0$\tilde{H}_1(g) \ne 0$ if any edges of an undirected graph g$g$ is contained in a cycle of length ⩾5$\geqslant 5$ .
DOI:
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发表时间:
2023
期刊:
Proceedings of the Royal Society of Edinburgh Section A
影响因子:
--
作者:
Yasuhiko Asao;Yasuaki Hiraoka;Shu Kanazawa
通讯作者:
Shu Kanazawa
影响因子:
0.9
作者:
Kaneta Ryuki;Yoshinaga Masahiko
通讯作者:
Yoshinaga Masahiko