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Homological dimensions relative to preresolving subcategories II

  • Zhaoyong Huang EMAIL logo
Published/Copyright: March 1, 2022

Abstract

Let 𝒜 be an abelian category having enough projective and injective objects, and let 𝒯 be an additive subcategory of 𝒜 closed under direct summands. A known assertion is that in a short exact sequence in 𝒜, the 𝒯-projective (resp. 𝒯-injective) dimensions of any two terms can sometimes induce an upper bound of that of the third term by using the same comparison expressions. We show that if 𝒯 contains all projective (resp. injective) objects of 𝒜, then the above assertion holds true if and only if 𝒯 is resolving (resp. coresolving). As applications, we get that a left and right Noetherian ring R is n-Gorenstein if and only if the Gorenstein projective (resp. injective, flat) dimension of any left R-module is at most n. In addition, in several cases, for a subcategory 𝒞 of 𝒯, we show that the finitistic 𝒞-projective and 𝒯-projective dimensions of 𝒜 are identical.

MSC 2010: 18G25; 16E10

Communicated by Manfred Droste


Award Identifier / Grant number: 11971225

Award Identifier / Grant number: 12171207

Funding statement: The research was partially supported by NSFC (Grant Nos. 11971225, 12171207).

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Received: 2021-06-04
Revised: 2021-12-23
Published Online: 2022-03-01
Published in Print: 2022-03-01

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