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arXiv 2302.12905math.RA
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模型结构、n-Gorenstein平坦模与PGF维数

Model structures, n-Gorenstein flat modules and PGF dimensions

Rachid El Maaouy

AI总结:

本文在有单位元的环上构造了以特定Gorenstein平坦维数模类为余纤维对象的阿贝尔模型结构,并证明其同伦范畴三角等价于特定稳定范畴;同时探讨了模与环的PGF维数,证明其可作为Gorenstein投射维数的替代定义。

摘要:

给定非负整数 $n$ 和有单位元的环 $R$,我们在左 $R$-模范畴上构造了一个阿贝尔模型结构,其中余纤维对象类与 $\mathcal{GF}_n(R)$ 重合(即 Gorenstein 平坦维数小于 $n$ 的左 $R$-模类),纤维对象类与 $\mathcal{F}_n(R)^\perp$ 重合(即平坦维数小于 $n$ 的左 $R$-模的右 ${\rm Ext}$-正交类),平凡对象类与 $\mathcal{PGF}(R)^\perp$ 重合(即 Šaroch 和 Šťovíček 近期引入的 PGF 左 $R$-模的右 ${\rm Ext}$-正交类)。该模型结构的同伦范畴在模去平坦-余挠模后,三角等价于稳定范畴 $\underline{\mathcal{GF}(R)\cap\mathcal{C}(R)}$,且当 $R$ 具有有限的全局 Gorenstein AC-投射维数时,它是紧生成的。本文第二部分探讨模与环的 PGF 维数。结果表明该维数可作为 Gorenstein 投射维数的替代定义。我们证明了($n$-)完美环可以用类似于经典情形的 Gorenstein 同调维数来刻画,且全局 Gorenstein 投射维数与全局 PGF 维数一致。

英文摘要:

Given a non-negative integer $n$ and a ring $R$ with identity, we construct an abelian model structure on the category of left $R$-modules where the class of cofibrant objects coincides with $\mathcal{GF}_n(R)$ the class of left $R$-modules with Gorenstein flat dimension less than $n$, the class of fibrant objects coincides with $\mathcal{F}_n(R)^\perp$ the right ${\rm Ext}$-orthogonal class of left $R$-modules with flat dimension less than $n$, and the class of trivial objects coincides with $\mathcal{PGF}(R)^\perp$ the right ${\rm Ext}$-orthogonal class of PGF left $R$-modules recently introduced by Šaroch and Šťov\'ıček. The homotopy category of this model structure is triangulated equivalent to the stable category $\underline{\mathcal{GF}(R)\cap\mathcal{C}(R)}$ modulo flat-cotorsion modules and it is compactly generated when $R$ has finite global Gorenstein AC-projective dimension. The second part of this paper deals with the PGF dimension of modules and rings. Our results suggest that this dimension could serve as an alternative definition of the Gorenstein projective dimension. We show, among other things, that ($n$-)perfect rings can be characterized in terms of Gorenstein homological dimensions, similar to the classical ones, and the global Gorenstein projective dimension coincides with the global PGF dimension.

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