Cofiniteness with respect to extension of Serre subcategories

preprint2022arXivOpen access

Abstract

Let a\mathfrak{a} be an ideal of a commutative noetherian ring RR, S\mathcal{S} a Serre subcategory of RR-modules satisfying the condition CaC_\mathfrak{a} and N\mathcal{N} the subcategory of finitely generated RR-modules. In this paper, we continue the study of NS\mathcal{NS}-a\mathfrak{a}-cofinite modules with respect to the extension subcategory NS\mathcal{NS}, show that some classical results of a\mathfrak{a}-cofiniteness hold for NS\mathcal{NS}-a\mathfrak{a}-cofiniteness in the cases dimR=d\mathrm{dim}R=d or dimR/a=d−1\mathrm{dim}R/\mathfrak{a}=d-1, where dd is a positive integer. We also study NS\mathcal{NS}-a\mathfrak{a}-cofiniteness of local cohomology modules and the modules ExtRi(N,M)\mathrm{Ext}^i_R(N,M) and ToriR(N,M)\mathrm{Tor}_i^R(N,M).

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