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arXiv 0904.3510math.AC
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短Gorenstein局部环上的自由分解

Free resolutions over short Gorenstein local rings

Inês B. Henriques, Liana M. Şega

摘要:

设R是局部环,其极大理想m允许非零元a \in \fm,且理想(0:a)同构于R/aR.本文研究了R-模M的极小自由分解,特别是当m^4=0时的情形。设e表示m的生成元的最小数目。若R是Gorenstein且m^4=0,\ge 3,我们证明了对于每个生成的R-模M,\Poi MRt是有理数且分母\HH R{-t} =1-et+et^2-t^3.特别是,这个结论适用于一般Gorenstein代数的socle度3。

英文摘要:

Let R be a local ring with maximal ideal m admitting a non-zero element a\in\fm for which the ideal (0:a) is isomorphic to R/aR. We study minimal free resolutions of finitely generated R-modules M, with particular attention to the case when m^4=0. Let e denote the minimal number of generators of m. If R is Gorenstein with m^4=0 and e\ge 3, we show that \Poi MRt is rational with denominator \HH R{-t} =1-et+et^2-t^3, for each finitely generated R-module M. In particular, this conclusion applies to generic Gorenstein algebras of socle degree 3.

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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