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

Published 18 Nov 2012 in math.AC | (1211.4204v1)

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

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