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arXiv · 2210.02277

Foxby equivalence relative to $C$-$fp_n$-injective and $C$-$fp_{n}$-flat modules

Mostafa Amini·Alireza Vahidi·Farideh Rezaei
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Abstract

Let $R$ and $S$ be rings, $C= {}_SC_R$ a (faithfully) semidualizing bimodule, and $n$ a positive integer or $n=\infty$. In this paper, we introduce the concepts of $C$-$fp_n$-injective $R$-modules and $C$-$fp_n$-flat $S$-modules as a common generalization of some known modules such as $C$-$FP_{n}$-injective (resp. $C$-weak injective) $R$-modules and $C$-$FP_{n}$-flat (resp. $C$-weak flat) $S$-modules. Then we investigate $C$-$fp_{n}$-injective and $C$-$fp_{n}$-flat dimensions of modules, where the classes of these modules, namely $Cfp_nI(R)_{\leq k}$ and $Cfp_nF(S)_{\leq k}$, respectively. We study Foxby equivalence relative to these classes, and also the existence of $Cfp_nI(R)_{\leq k}$ and $Cfp_nF(S)_{\leq k}$ preenvelopes and covers. Finally, we study the exchange properties of these classes, as well as preenvelopes (resp. precovers) and Foxby equivalence, under almost excellent extensions of rings.

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Mostafa Amini, Alireza Vahidi, Farideh Rezaei. 2022-10-05. Foxby equivalence relative to $C$-$fp_n$-injective and $C$-$fp_{n}$-flat modules. https://arxiv.org/abs/2210.02277

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