English

Acyclicity test of complexes modulo Serre subcategories using the residue fields

Commutative Algebra 2025-04-17 v2 Rings and Algebras

Abstract

Let RR be a commutative noetherian ring, and let S\mathscr{S}(resp. L\mathscr{L}) be a Serre(resp. localizing) subcategory of the category of RR-modules. If F\Bbb F is an unbounded complex of RR-modules Tor-perpendicular to S\mathscr{S} and dd is an integer, then \HHidSRF\HH{i\geqslant d}{S\otimes_R \Bbb F} is in L\mathscr{L} for each RR-module SS in S\mathscr{S} if and only if \HHidk(\fp)RF\HH{i\geqslant d}{k(\fp)\otimes_R \Bbb F} is in L\mathscr{L} for each prime ideal \fp\fp such that R/\fpR/\fp is in S\mathscr{S}, where k(\fp)k(\fp) is the residue field at \fp\fp. As an application, we show that for any RR-module MM, \Tori0R(k(\fp),M)\Tor_{i\geqslant 0}^R(k(\fp),M) is in L\mathscr{L} for each prime ideal \fp\fp such that R/\fpR/\fp is in S\mathscr{S} if and only if \ExtRi0(S,M)\Ext^{i \geqslant 0}_R(S,M) is in L\mathscr{L} for each cyclic RR-module SS in S\mathscr{S}. We also obtain some new characterizations of regular and Gorenstein rings in the case of S\mathscr{S} consists of finite modules with supports in a specialization-closed subset V(I)V(I) of \SpecR\Spec R.

Keywords

Cite

@article{arxiv.2503.06354,
  title  = {Acyclicity test of complexes modulo Serre subcategories using the residue fields},
  author = {Mitsuyasu Hashimoto and Xi Tang},
  journal= {arXiv preprint arXiv:2503.06354},
  year   = {2025}
}
R2 v1 2026-06-28T22:12:25.710Z