On connectedness and indecomposibility of local cohomology modules |
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Authors: | Peter Schenzel |
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Affiliation: | 1.Institut für Informatik,Martin-Luther-Universit?t Halle-Wittenberg,Halle (Saale),Germany |
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Abstract: | Let I denote an ideal of a local Gorenstein ring . Then we show that the local cohomology module , c = height I, is indecomposable if and only if V(I d ) is connected in codimension one. Here I d denotes the intersection of the highest dimensional primary components of I. This is a partial extension of a result shown by Hochster and Huneke in the case I the maximal ideal. Moreover there is an analysis of connectedness properties in relation to various aspects of local cohomology. Among others we show that the endomorphism ring of is a local Noetherian ring if dim R/I = 1. |
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Keywords: | KeywordHeading" >Mathematics Subject Classification (2000) Primary 13D45 Secondary 14B15 13H10 |
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