Upper bounds, cofiniteness, and artinianness of local cohomology modules defined by a pair of ideals

preprint2012arXivOpen access

Abstract

Let RR be a commutative noetherian ring, I,JI,J be two ideals of RR, MM be an RR-module, and S\mathcal{S} be a Serre class of RR-modules. A positive answer to the Huneke,^,s conjecture is given for a noetherian ring RR and minimax RR-module MM of krull dimension less than 3, with respect to S\mathcal{S}. There are some results on cofiniteness and artinianness of local cohomology modules with respect to a pair of ideals. For a ZD-module MM of finite krull dimension and an integer n∈Nn\in\mathbb{N}, if $\lc^{i}_{I,J}(M)\in\mathcal{S}$ for all i>ni>n, then $\lc^{i}_{I,J}(M)/\fa^{j}\lc^{i}_{I,J}(M)\in\mathcal{S}$ for any $\fa\in\tilde{W}(I,J)$, all i≥ni\geq n, and all j≥0j\geq0. By introducing the concept of Seree cohomological dimension of MM with respect to (I,J)(I,J), for an integer r∈N0r\in\mathbb{N}_0, $\lc^{j}_{I,J}(R)\in\mathcal{S}$ for all j>rj>r iff $\lc^{j}_{I,J}(M)\in\mathcal{S}$ for all j>rj>r and any finite RR-module MM.

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