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arXiv 1012.1703math.RAmath.RT
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关于模的Auslander型条件

On Auslander-Type Conditions of Modules

Zhaoyong Huang

摘要:

本文证明了对左、右诺特环$R$,$_RR$满足Auslander条件当且仅当每个平坦左$R$ -模都满足Auslander条件,当且仅当任何内射左$R$ -模的极小平坦分解中的$i$ th项的内射维数对任何$i \geq 1$至多为$i-1$,当且仅当平坦(分别为.单射)维数的最小单射共归结(分别为)中的$i$ th项。平坦分辨率)的任何左侧$R$ -模块$M$最多是平坦的(分别对于任何$i \geq 1$,$M$加上$i-1$的单射)维数,当且仅当平坦(分别为内射)内射包络的维度(分别任何左侧$R$模块$M$的平面盖)最多为平面(分别单射)维度的$M$,当且仅当任何上述条件的相反版本成立。证明了对满足Auslander条件的Artin代数$R$,$R$是Gorenstein当且仅当由满足Auslander条件的有限生成模组成的子范畴是逆变有限的.作为应用,我们得到了Auslander-Gorenstein环和Auslander-正则环的一些等价刻画.

英文摘要:

We prove that for a left and right Noetherian ring $R$, $_RR$ satisfies the Auslander condition if and only if so does every flat left $R$-module, if and only if the injective dimension of the $i$th term in a minimal flat resolution of any injective left $R$-module is at most $i-1$ for any $i \geq 1$, if and only if the flat (resp. injective) dimension of the $i$th term in a minimal injective coresolution (resp. flat resolution) of any left $R$-module $M$ is at most the flat (resp. injective) dimension of $M$ plus $i-1$ for any $i \geq 1$, if and only if the flat (resp. injective) dimension of the injective envelope (resp. flat cover) of any left $R$-module $M$ is at most the flat (resp. injective) dimension of $M$, and if and only if any of the opposite versions of the above conditions hold true. Furthermore, we prove that for an Artinian algebra $R$ satisfying the Auslander condition, $R$ is Gorenstein if and only if the subcategory consisting of finitely generated modules satisfying the Auslander condition is contravariantly finite. As applications, we get some equivalent characterizations of Auslander-Gorenstein rings and Auslander-regular rings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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