Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4597501 | Journal of Pure and Applied Algebra | 2009 | 14 Pages |
Abstract
Let HâZd be a positive semigroup generated by AâH, and let K[H] be the associated semigroup ring over a field K. We investigate heredity of the Cohen-Macaulay property from K[H] to both its A-Newton graded ring and to its face rings. We show by example that neither one inherits in general the Cohen-Macaulay property. On the positive side, we show that for every H there exist generating sets A for which the Newton graduation preserves Cohen-Macaulayness. This gives an elementary proof for an important vanishing result on A-hypergeometric Euler-Koszul homology. As a tool for our investigations we develop an algorithm to compute algorithmically the Newton filtration on a toric ring.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
Mathias Schulze, Uli Walther,