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September 28, 20250 citationsOpen Access

Acyclicity test of complexes modulo Serre subcategories using the residue fields

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MHMasaharu HashimotoTXTang Xi

Key Points

  • Acyclicity of complexes modulates the interplay between Serre and localizing subcategories.
  • Residue fields play a crucial role in establishing equivalence conditions for modules across subcategories: $ ext{Ext}^{i eq 0}$ and $ ext{Tor}^{i eq 0}$ validate local embeddings.
  • Characterizations of regular and gorenstein rings emerge from specific conditions on Serre subcategories of finite modules.
  • The framework built here extends to complexes of $ ext{R}$-modules, demonstrating powerful results in homological algebra.

Abstract

Let R be a commutative noetherian ring, and let S (resp. L) be a Serre (resp. localizing) subcategory of the category of R-modules. If F is an unbounded complex of R-modules Tor-perpendicular to S and d is an integer, then i dSR F is in L for each R-module S in S if and only if i dk () R F is in L for each prime ideal such that R/ is in S, where k () is the residue field at. As an application, we show that for any R-module M, ₈ ₀R (k (), M) is in L for each prime ideal such that R/ is in S if and only if ^i 0R (S, M) is in L for each cyclic R-module S in S. We also obtain some new characterizations of regular and Gorenstein rings in the case of S consists of finite modules with supports in a specialization-closed subset V (I) of R.

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Cite This Study

Hashimoto et al. (2025) studied this question.

synapsesocial.com/papers/68d90a0a41e1c178a14f68d9https://doi.org/10.48550/arxiv.2503.06354
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