A note on the injective dimension of local cohomology modules

A note on the injective dimension of local cohomology modules
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DOI:
10.1090/s0002-9939-08-09198-3
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发表时间:
2007-03
期刊:
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通讯作者:
M. Hellus
M. Hellus
中科院分区:
其他
文献类型:
--
作者:
M. Hellus

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对于一个Noether环R,如果存在R的理想I使得M是I-上有限的,则称R-模M是上有限的;我们证明了每个上有限模M都满足dim R(M)< injdim R(M)。作为应用,我们研究了局部上同调模H i I(R)满足i dim R(H i I(R))= dim R(H i I(R))的问题.有两种情况的答案是肯定的。另一方面,我们提出了两个反例,这两个例子的失败来自不同的原因。
For a Noetherian ring R we call an R-module M cofinite if there exists an ideal I of R such that M is I-cofinite; we show that every cofinite module M satisfies dim R (M) < injdim R (M). As an application we study the question which local cohomology modules H i I (R) satisfy injdim R (H i I (R)) = dim R (H i I (R)). There are two situations where the answer is positive. On the other hand, we present two counterexamples, the failure in these two examples coming from different reasons.