English

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

Representation Theory 2024-10-04 v1

Abstract

Let Λ\Lambda be a finite-dimensional basic algebra. Sakai recently used certain sequences of image-cokernel-extension-closed (ICE-closed) subcategories of finitely generated Λ\Lambda-modules to classify certain (generalized) intermediate tt-structures in the bounded derived category. We classifying these "contravariantly finite ICE-sequences" using concepts from τ\tau-tilting theory. More precisely, we introduce "cogen-preordered τ1\tau^{-1}-rigid modules" as a generalization of (the dual of) the "TF-ordered τ\tau-rigid modules" of Mendoza and Treffinger. We then establish a bijection between the set of cogen-preordered τ1\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)(m+1)-intermediate tt-structures whose aisles are homology-determined.

Keywords

Cite

@article{arxiv.2410.01963,
  title  = {Sequences of ICE-closed subcategories via preordered $\tau^{-1}$-rigid modules},
  author = {Eric J. Hanson},
  journal= {arXiv preprint arXiv:2410.01963},
  year   = {2024}
}

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15 pages