,
Michael Kerber
Creative Commons Attribution 4.0 International license
We study the decomposition of zero-dimensional persistence modules, viewed as functors valued in the category of vector spaces factorizing through sets. Instead of working directly at the level of vector spaces, we take a step back and first study the decomposition problem at the level of sets. This approach allows us to define the combinatorial notion of rooted subsets. In the case of a filtered metric space M, rooted subsets relate the clustering behavior of the points of M with the decomposition of the associated persistence module. In particular, we can identify intervals in such a decomposition quickly. In addition, rooted subsets can be understood as a generalization of the elder rule, and are also related to the notion of constant conqueror of Cai, Kim, Mémoli and Wang. As an application, we give a lower bound on the number of intervals that we can expect in the decomposition of zero-dimensional persistence modules of a density-Rips filtration in Euclidean space: in the limit, and under very general circumstances, we can expect that at least 25% of the indecomposable summands are interval modules.
@InProceedings{alonso_et_al:LIPIcs.SoCG.2023.7,
author = {Alonso, \'{A}ngel Javier and Kerber, Michael},
title = {{Decomposition of Zero-Dimensional Persistence Modules via Rooted Subsets}},
booktitle = {39th International Symposium on Computational Geometry (SoCG 2023)},
pages = {7:1--7:16},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-273-0},
ISSN = {1868-8969},
year = {2023},
volume = {258},
editor = {Chambers, Erin W. and Gudmundsson, Joachim},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2023.7},
URN = {urn:nbn:de:0030-drops-178570},
doi = {10.4230/LIPIcs.SoCG.2023.7},
annote = {Keywords: Multiparameter persistent homology, Clustering, Decomposition of persistence modules, Elder Rule}
}