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arXiv 2501.05940math.AC
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非局部秩的诺特环

Noetherian rings of non-local rank

Dmitry Kudryakov

AI总结:

本文刻画了秩不等于其在极大理想处局部化秩上确界的诺特环,证明这类环必为有限个局部主 Artin 环与 Dedekind 整环的直积,并应用于 Artin 环上多项式环的局部秩计算。

摘要:

环 $R$ 的秩是指 $R$ 中所有理想 $I$ 的生成集最小基数的上确界。本文给出了诺特环 $R$ 的一个刻画,其中 $R$ 的秩不等于 $R$ 在极大理想处局部化的秩的上确界。结果表明,任何这样的环都是有限个局部主 Artin 环和 Dedekind 整环的直积,且其中至少有一个不是主理想环。作为一个应用,我们证明了 Artin 环上多项式环的秩可以局部地计算。

英文摘要:

The rank of a ring $R$ is the supremum of minimal cardinalities of generating sets of $I$, among all ideals $I$ in $R$. In this paper, we obtain a characterization of Noetherian rings $R$ whose rank is not equal to the supremum of ranks of localizations of $R$ at maximal ideals. It turns out that any such ring is a direct product of a finite number of local principal Artinian rings and Dedekind domains, at least one of which is not a principal ideal ring. As an application, we show that the rank of the ring of polynomials over an Artinian ring can be computed locally.

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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