English

Torsion pairs in categories of modules on ringed finite sites

Representation Theory 2025-06-23 v2

Abstract

Let C\mathcal{C} be a small category. In this paper, we mainly study the category of modules M\mboxodR\mathfrak{M}\mbox{od-}\mathfrak{R} on ringed sites (C,R)(\mathbf{C},\mathfrak{R}). We firstly reprove the Theorem A of the paper (M. Wu and F. Xu. Skew category algebras and modules on ringed finite sites. J. A. 631, 2023), then we characterize M\mboxodR\mathfrak{M}\mbox{od-}\mathfrak{R} in terms of the torsion modules on Gr(R)Gr(\mathfrak{R}), where Gr(R)Gr(\mathfrak{R}) is the linear Grothendieck construction of R\mathfrak{R}. Finally, we investigate the hereditary torsion pairs, TTF triples and Abelian recollements of M\mboxodR\mathfrak{M}\mbox{od-}\mathfrak{R}. When C\mathcal{C} is finite, the complete classifications of all these are given respectively.

Keywords

Cite

@article{arxiv.2403.15001,
  title  = {Torsion pairs in categories of modules on ringed finite sites},
  author = {Mawei Wu},
  journal= {arXiv preprint arXiv:2403.15001},
  year   = {2025}
}

Comments

16 pages, final version, accepted for publication in Communications in Algebra