On the category of modules of Gorenstein dimension zero

On the category of modules of Gorenstein dimension zero
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DOI:
10.1007/s00209-005-0795-8
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发表时间:
2005-05
影响因子:
0.8
通讯作者:
Ryo Takahashi
Ryo Takahashi
中科院分区:
数学2区
文献类型:
--
作者:
Ryo Takahashi

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设R是交换的Noether Henselian非Gorenstein局部环,环的深度为零。用modR表示所有非生成R-模的范畴,用 modR的全子范畴,由Gorenstein维数为零的所有R-模组成。本文证明,如果 包含非自由模,则它在modR中不是预覆盖的,特别是存在无穷多个Gorenstein维数为零的不可分解R-模的同构类。
LetRbe a commutative noetherian henselian non-Gorenstein local ring of depth zero. Denote by modRthe category of all finitely generatedR-modules, and by the full subcategory of modRconsisting of all R-modules of Gorenstein dimension zero. We prove in this paper that if contains a non-free module, then it is not precovering in modR, in particular, there exist infinitely many isomorphism classes of indecomposableR-modules of Gorenstein dimension zero.