Cohen-Macaulay multigraded modules

Details Cohen-Macaulay multigraded modules Cohen-Macaulay multigraded modules

2007-05-13

arxiv.org/abs/0705.1839v1

Mathematics

Commutative Algebra

16 pages

Scientific paper

Let S be a standard N^r-graded algebra over a local ring A, and let M be a finitely generated Z^r-graded S-module. We characterize the Cohen-Macaulayness of M in terms of the vanishing of certain sheaf cohomology modules. As a consequence, we apply our result to study the Cohen-Macaulayness of multi-Rees modules (also called Rees modification). Our work extends previous studies on the Cohen-Macaulayness of multi-Rees algebras.

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