Local characterizations for decomposability of 2-parameter persistence modules
Abstract
We investigate the existence of sufficient local conditions under which poset representations decompose as direct sums of indecomposables from a given class. In our work, the indexing poset is the product of two totally ordered sets, corresponding to the setting of 2-parameter persistence in topological data analysis. Our indecomposables of interest belong to the so-called interval modules, which by definition are indicator representations of intervals in the poset. While the whole class of interval modules does not admit such a local characterization, we show that the subclass of rectangle modules does admit one and that it is, in some precise sense, the largest subclass to do so.
Cite
@article{arxiv.2008.02345,
title = {Local characterizations for decomposability of 2-parameter persistence modules},
author = {Magnus Bakke Botnan and Vadim Lebovici and Steve Oudot},
journal= {arXiv preprint arXiv:2008.02345},
year = {2022}
}
Comments
Accepted in Algebras and Representation Theory. 44 pages. Proofs and exposition simplified. We thank the anonymous referees for their invaluable comments