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arXiv 1707.04056math.AC
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关于良好与不良的Artinian Gorenstein局部环研究

A Study of Good and Bad Artinian Gorenstein local Rings

Indian Institute of Science Education and Research(印度科学教育研究所)

Anjan Gupta, Shrikant Shekhar

AI总结:

本文研究了Artinian Gorenstein局部环的良坏性质,证明了特定条件下此类环为良好,并给出了不良环的例子。

摘要:

我们说一个局部环R在Roos的意义下是良好的,如果所有有限生成的R-模都有有理Poincaré级数且有共同的分母;否则,R被称为不良的。一个重要良好的环类是广义Golod环类。在本文中,我们证明了Artinian Gorenstein广义Golod环的连通和是良好的。我们提供了一个将Artinian Gorenstein局部环分解为连通和的标准。作为关键应用,我们证明了一个Gorenstein局部环R,其极大理想为m,若满足以下条件之一,则R是良好的:(1)R的乘数不超过12且其h向量不同于(1, 5, 5, 1);(2)m⁴=0且m²由至多四个元素生成。上述结果在一定程度上解决了L.Avramov提出的问题。我们还给出了任何乘数大于等于18的不良Artinian Gorenstein局部环的例子。在所有这些情况下,证明环是良好的结果都是通过证明环是广义Golod环来获得的。

英文摘要:

We say that a local ring $R$ is good, in the sense of Roos, if all finitely generated $R$-modules have rational Poincaré series that share a common denominator; otherwise, $R$ is said to be bad. An important class of good rings is the class of generalized Golod rings. In this paper, we show that connected sums of Artinian Gorenstein generalized Golod rings are good. We provide a criterion for decomposing Artinian Gorenstein local rings as connected sums. As a key application, we prove that a Gorenstein local ring $R$ with maximal ideal $\mathfrak{m}$ is good under either of the following conditions: (1) the multiplicity of $R$ is at most $12$ and its $h$-vector is different from $(1, 5, 5, 1)$, (2) $\mathfrak{m}^4$ = 0 and $\mathfrak{m}^2$ is generated by at most four elements. The above result records partial progress towards resolving a question posed by L.~Avramov. We also present examples of bad Artinian Gorenstein local rings of any multiplicity greater than or equal to $18$. In all these cases, the results establishing that the rings are good are obtained by showing that the rings are generalized Golod 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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