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Sequences of ICE-closed subcategories via preordered $\tau^{-1}$-rigid modules

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arxiv 2410.01963 v1 pith:E3V6RH2W submitted 2024-10-02 math.RT

classification math.RT
keywords modulesrigidcertainfinitesequencesbijectioncogen-preorderedcontravariantly
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abstract

Let $\Lambda$ be a finite-dimensional basic algebra. Sakai recently used certain sequences of image-cokernel-extension-closed (ICE-closed) subcategories of finitely generated $\Lambda$-modules to classify certain (generalized) intermediate $t$-structures in the bounded derived category. We classifying these "contravariantly finite ICE-sequences" using concepts from $\tau$-tilting theory. More precisely, we introduce "cogen-preordered $\tau^{-1}$-rigid modules" as a generalization of (the dual of) the "TF-ordered $\tau$-rigid modules" of Mendoza and Treffinger. We then establish a bijection between the set of cogen-preordered $\tau^{-1}$-rigid modules and certain sequences of intervals of torsion-free classes. Combined with the results of Sakai, this yields a bijection with the set of contravariantly finite ICE-sequences (of finite length), and thus also with the set of $(m+1)$-intermediate $t$-structures whose aisles are homology-determined.

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  1. ICE-closed subcategories and epibricks over recollements

    math.RT 2025-02 conditional novelty 5.0 of 10

    Over a recollement of abelian categories, ICE-closed subcategories, epibricks and monobricks glue and reduce along the recollement, yielding a bijection for ICE-closed subcategories under a natural containment condition.

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