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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(e) ISSN 0002-9939(p)

     

Finiteness properties of local cohomology modules for $ \mathfrak{a}$-minimax modules

Author(s): Jafar Azami; Reza Naghipour; Bahram Vakili
Journal: Proc. Amer. Math. Soc. 137 (2009), 439-448.
MSC (2000): Primary 13D45, 14B15, 13E05
Posted: August 25, 2008
MathSciNet review: 2448562
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Abstract | References | Similar articles | Additional information

Abstract: Let $ R$ be a commutative Noetherian ring and $ \mathfrak{a}$ an ideal of $ R$. In this paper we introduce the concept of $ \mathfrak{a}$-minimax $ R$-modules, and it is shown that if $ M$ is an $ \mathfrak{a}$-minimax $ R$-module and $ t$ a non-negative integer such that $ {\rm H}_\mathfrak{a}^i(M)$ is $ \mathfrak{a}$-minimax for all $ i<t$, then for any $ \mathfrak{a}$-minimax submodule $ N$ of $ {\rm H}_\mathfrak{a}^t(M)$, the $ R$-module $ {\rm Hom}_R(R/\mathfrak{a},{\rm H}_\mathfrak{a}^t(M)/N)$ is $ \mathfrak{a}$-minimax. As a consequence, it follows that the Goldie dimension of $ {\rm H}_\mathfrak{a}^t(M)/N$ is finite, and so the associated primes of $ {\rm H}_\mathfrak{a}^t(M)/N$ are finite. This generalizes the main result of Brodmann and Lashgari (2000).


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Additional Information:

Jafar Azami
Affiliation: Department of Mathematics, University of Tabriz, Tabriz 51666-16471, Iran - and - Department of Mathematics, Mohaghegh Ardabily University, Ardabil, Iran
Email: azami@tabrizu.ac.ir

Reza Naghipour
Affiliation: Department of Mathematics, University of Tabriz, Tabriz 51666-16471, Iran - and - School of Mathematics, Institute for Studies in Theoretical Physics and Mathematics (IPM), P.O. Box 19395-5746, Tehran, Iran
Email: naghipour@ipm.ir, naghipour@tabrizu.ac.ir

Bahram Vakili
Affiliation: Department of Mathematics, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran - and - Department of Mathematics, Shabestar Islamic Azad University, Shabestar, Iran
Email: bvakil@iaushab.ac.ir

DOI: 10.1090/S0002-9939-08-09530-0
PII: S 0002-9939(08)09530-0
Keywords: Goldie dimension, $\mathfrak a$-minimax modules, $\mathfrak a$-cominimax modules, local cohomology, associated primes.
Received by editor(s): October 3, 2007,
Received by editor(s) in revised form: January 18, 2008
Posted: August 25, 2008
Additional Notes: The research of the second author was supported in part by a grant from IPM (No.~86130031)
Communicated by: Bernd Ulrich
Copyright of article: Copyright 2008, American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.




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