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Corrigendum to "$m$-Periodic Gorenstein objects" [J. Algebra 621 (2023)]

Representation Theory 2024-03-19 v1 Category Theory

Abstract

Let (A,B)(\mathcal{A,B}) be a GP-admissible pair and (Z,W)(\mathcal{Z,W}) be a GI-admissible pair of classes of objects in an abelian category C\mathcal{C}, and consider the class πGP(ω,B,1)\pi\mathcal{GP}_{(\omega,\mathcal{B},1)} of 11-periodic (ω,B)(\omega,\mathcal{B})-Gorenstein projective objects, where ω:=AB\omega := \mathcal{A} \cap \mathcal{B} and ν:=ZW\nu := \mathcal{Z} \cap \mathcal{W}. We claimed in \cite[Lem. 8.1]{HMP2023m} that the (Z,W)(\mathcal{Z,W})-Gorenstein injective dimension of πGP(ω,B,1)\pi\mathcal{GP}_{(\omega,\mathcal{B},1)} is bounded by the (Z,W)(\mathcal{Z,W})-Gorenstein injective dimension of ω\omega, provided that: (1) ω\omega is closed under direct summands, (2) Ext1(πGP(ω,B,1),ν)=0\mathrm{Ext}^1(\pi\mathcal{GP}_{(\omega,\mathcal{B},1)},\nu) = 0, and (3) every object in πGP(ω,B,1)\pi\mathcal{GP}_{(\omega,\mathcal{B},1)} admits a Hom(,ν)\mathrm{Hom}(-,\nu)-acyclic ν\nu-coresolution. These conditions are their duals are part of what we called ``Setup 1''. Moreover, if we replace πGP(ω,B,1)\pi\mathcal{GP}_{(\omega,\mathcal{B},1)} by the class GP(A,B)\mathcal{GP}_{(\mathcal{A,B})} of (A,B)(\mathcal{A,B})-Gorenstein projective objects, the resulting inequality is claimed to be true under a set of conditions named ``Setup 2''. The proof we gave for the claims Gid(Z,W)(πGP(ω,B,1))Gid(Z,W)(ω)\mathrm{Gid}_{(\mathcal{Z,W})}(\pi\mathcal{GP}_{(\omega,\mathcal{B},1)}) \leq \mathrm{Gid}_{(\mathcal{Z,W})}(\omega) and Gid(Z,W)(GP(A,B))Gid(Z,W)(ω)\mathrm{Gid}_{(\mathcal{Z,W})}(\mathcal{GP}_{(\mathcal{A,B})}) \leq \mathrm{Gid}_{(\mathcal{Z,W})}(\omega) is incorrect, and the purpose of this note is to exhibit a corrected proof of the first inequality, under the additional assumption that every object in πGP(ω,B,1)\pi\mathcal{GP}_{(\omega,\mathcal{B},1)} has finite injective dimension relative to Z\mathcal{Z}. Setup 2 is no longer required, and as a result the second inequality was removed. We also fix those results in \S \ 8 of \cite{HMP2023m} affected by Lemma 8.1, and comment some applications and examples.

Keywords

Cite

@article{arxiv.2403.10525,
  title  = {Corrigendum to "$m$-Periodic Gorenstein objects" [J. Algebra 621 (2023)]},
  author = {Mindy Y. Huerta and Octavio Mendoza and M. A. Pérez},
  journal= {arXiv preprint arXiv:2403.10525},
  year   = {2024}
}

Comments

10 pages. arXiv admin note: text overlap with arXiv:2207.00075