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COMPARISON OF MULTIGRADED AND UNGRADED COUSIN COMPLEXES
Published online by Cambridge University Press: 20 January 2009
Abstract
This paper generalizes, in two senses, work of Petzl and Sharp, who showed that, for a $\mathbb{Z}$-graded module $M$ over a $\mathbb{Z}$-graded commutative Noetherian ring $R$, the graded Cousin complex for $M$ introduced by Goto and Watanabe can be regarded as a subcomplex of the ordinary Cousin complex studied by Sharp, and that the resulting quotient complex is always exact. The generalizations considered in this paper are, firstly, to multigraded situations and, secondly, to Cousin complexes with respect to more general filtrations than the basic ones considered by Petzl and Sharp. New arguments are presented to provide a sufficient condition for the exactness of the quotient complex in this generality, as the arguments of Petzl and Sharp will not work for this situation without additional input.
AMS 2000 Mathematics subject classification: Primary 13A02; 13E05; 13D25; 13D45
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- Copyright © Edinburgh Mathematical Society 2001