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Commutative Noetherian rings possessing a homological property

机译:具有同源性质的可交换Noetherian环

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摘要

For a commutative Noetherian local ring A, we have the following proposition: A is a Gorenstein ring if and only if for all finitely generated A-modules M, id_AM is finite if and only if pd_AM is finite. Now, we consider the following property: givena Noetherian local ring A, for an arbitrary finitely generated A-module M, id_AM is finite, implying that pd_AM is finite, We ask: what ring is characterized by the above property? In this note, we first consider the above question; then for commutativeNoetherian ring A (not necessarily local), we consider the similar problem. In this note, we use A to denote a commutative Noetherian ring with identity. For A-modules M, we use pd_AM to denote projective dimension of M as A-module and id_AM to denote injective dimension of M as A-module. Moreover, we denote positive infinity by +co and assume by convention that +infinity = + infinity. We use standard reference-book.
机译:对于可交换的Noetherian局部环A,我们有以下命题:当且仅当对于所有有限生成的A模块M,且仅当pd_AM是有限的,id_AM是有限的,A是Gorenstein环。现在,我们考虑以下属性:给定Noetherian局部环A,对于任意有限生成的A-模M,id_AM是有限的,这意味着pd_AM是有限的。我们问:上述属性的特征是什么?在本说明中,我们首先考虑上述问题;那么对于可交换的Noether环A(不一定是局部环),我们考虑类似的问题。在本说明中,我们使用A表示具有身份的可交换Noetherian环。对于A模M,我们使用pd_AM将M的射影维表示为A模块,将id_AM表示M的内射维为A模块。此外,我们用+ co表示正无穷大,并按照惯例假定+ infinity = +无穷大。我们使用标准的参考书。

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