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:
影响因子:
--
通讯作者:
M. Hellus
中科院分区:
文献类型:
--
作者:
M. Hellus
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.