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2002 On the dimension and multiplicity of local cohomology modules
Markus P. Brodmann, Rodney Y. Sharp
Nagoya Math. J. 167: 217-233 (2002).

Abstract

This paper is concerned with a finitely generated module $M$ over a(commutative Noetherian) local ring $R$. In the case when $R$ is a homomorphic image of a Gorenstein local ring, one can use the well-known associativity formula for multiplicities, together with local duality and Matlis duality, to produce analogous associativity formulae for the local cohomology modules of $M$ with respect to the maximal ideal. The main purpose of this paper is to show that these formulae also hold in the case when $R$ is universally catenary and such that all its formal fibres are Cohen-Macaulay. These formulae involve certain subsets of the spectrum of $R$ called the pseudo-supports of $M$; these pseudo-supports are closed in the Zariski topology when $R$ is universally catenary and has the property that all its formal fibres are Cohen-Macaulay. However, examples are provided to show that, in general, these pseudo-supports need not be closed. We are able to conclude that the above-mentioned associativity formulae for local cohomology modules do not hold over all local rings.

Citation

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Markus P. Brodmann. Rodney Y. Sharp. "On the dimension and multiplicity of local cohomology modules." Nagoya Math. J. 167 217 - 233, 2002.

Information

Published: 2002
First available in Project Euclid: 27 April 2005

zbMATH: 1044.13007
MathSciNet: MR1924724

Subjects:
Primary: 13D45
Secondary: 13C15 , 13H10

Rights: Copyright © 2002 Editorial Board, Nagoya Mathematical Journal

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