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arXiv 1611.00535math.RTmath.ACmath.RA
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余倾斜模的相对导出维数

Relative derived dimensions for cotilting modules

Michio Yoshiwaki

摘要:

对诺特环$R$和内射维数至少为$1$的共倾$R$ -模$T$,利用Auslander-Buchweitz理论和Ghost引理,证明了$R$关于范畴$\mathcal{X}_T$的导出维数恰为$T$的内射维数.特别地,当$R$是具有标准模$ω_R$和$\dim R\ge1$的交换Noether局部环时,R关于极大Cohen-Macaulay模范畴的导出维数正好是$\dim R$。

英文摘要:

For a Noetherian ring $R$ and a cotilting $R$-module $T$ of injective dimension at least $1$, we prove that the derived dimension of $R$ with respect to the category $\mathcal{X}_T$ is precisely the injective dimension of $T$ by applying Auslander-Buchweitz theory and Ghost Lemma. In particular, when $R$ is a commutative Noetherian local ring with a canonical module $ω_R$ and $\dim R\ge1$, the derived dimension of R with respect to the category of maximal Cohen-Macaulay modules is precisely $\dim R$.

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