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Flat model structures and Gorenstein objects in functor categories

Part of: Homological algebra General theory of categories and functors

Published online by Cambridge University Press:  14 May 2024

Zhenxing Di ,
Liping Li ,
Li Liang  and
Yajun Ma
Zhenxing Di
Affiliation:
School of Mathematical Sciences, Huaqiao University, Quanzhou 362021, China (dizhenxing@163.com)
Liping Li
Affiliation:
Department of Mathematics, Hunan Normal University, Changsha 410081, China (lipingli@hunnu.edu.cn)
Li Liang
Affiliation:
Department of Mathematics, Lanzhou Jiaotong University, Lanzhou 730070, China Gansu Provincial Research Center for Basic Disciplines of Mathematics and Statistics, Lanzhou 730070, China (lliangnju@gmail.com); https://sites.google.com/site/lliangnju
Yajun Ma
Affiliation:
Department of Mathematics, Lanzhou Jiaotong University, Lanzhou 730070, China (13919042158@163.com)
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Abstract

We construct a flat model structure on the category ${_{\mathcal {Q},\,R}\mathsf {Mod}}$ of additive functors from a small preadditive category $\mathcal {Q}$ satisfying certain conditions to the module category ${_{R}\mathsf {Mod}}$ over an associative ring $R$, whose homotopy category is the $\mathcal {Q}$-shaped derived category introduced by Holm and Jørgensen. Moreover, we prove that for an arbitrary associative ring $R$, an object in ${_{\mathcal {Q},\,R}\mathsf {Mod}}$ is Gorenstein projective (resp., Gorenstein injective, Gorenstein flat, projective coresolving Gorenstein flat) if and only if so is its value on each object of $\mathcal {Q}$, and hence improve a result by Dell'Ambrogio, Stevenson and Šťovíček.

Keywords

Gorenstein objectabelian model structurefunctor category

MSC classification

Primary: 18G25: Relative homological algebra, projective classes
Secondary: 18A25: Functor categories, comma categories

Information

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 156 , Issue 2 , April 2026 , pp. 343 - 363
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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