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arXiv 2603.04060math.AC
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交换环的小有限维数,III

The small finitistic dimensions of commutative rings, III

School of Mathematics and Statistics, Tianshui Normal University(天水师范学院数学与统计学院)

Xiaolei Zhang

AI总结:

本文研究了交换环的小有限维数,证明了其与有限生成理想和Ext的零性之间的关系,并应用于多种环类。

摘要:

环R的小有限维数fPD(R)被定义为R-模的有限射影维数的上确界。在本文中,我们证明,一个交换环R满足fPD(R)≤d当且仅当对于任何有限生成的理想I,如果对于每个i=0,…,d,Ext_R^i(R/I,R)=0,则对于所有i≥0,Ext_R^i(R/I,R)=0。作为应用,我们得出,对于任何交换环R,fPD(R)≤自FP-内射维数FP-Id_RR。我们还把这些结果应用于(w)(n,d)-环、DW环和普鲁弗型环。

英文摘要:

The small finitistic dimension fPD$(R)$ of a ring $R$ is defined to be the supremum of projective dimensions of $R$-modules with finite projective resolutions. In this paper, we show that a commutative ring $R$ has fPD$(R)\leq d$ if and only if for any finitely generated ideal $I$ of $R$, if $Ext_R^i(R/I,R)=0$ for each $i=0,\dots,d$, then $Ext_R^i(R/I,R)=0$ for all $i\geq 0.$ As applications, we obtain that, for any commutative ring $R$, fPD$(R)\leq \mbox{FP-}Id_RR$, the self-FP-injective dimension of $R$. We also give some applications of these results to (weak) $(n,d)$-rings, DW-rings and rings of Prufer type.

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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