Dualizing complex of a toric face ring

Details Dualizing complex of a toric face ring Dualizing complex of a toric face ring

2008-08-31

arxiv.org/abs/0809.0095v1

Mathematics

Commutative Algebra

22 pages

Scientific paper

A "toric face ring", which generalizes both Stanley-Reisner rings and affine semigroup rings, is studied by Bruns, Roemer and their coauthors recently. In this paper, under the "normality" assumption, we describe a dualizing complex of a toric face ring $R$ in a very concise way. Since $R$ is not a graded ring in general, the proof is not straightforward. We also develop the squarefree module theory over $R$, and show that the Buchsbaum property and the Gorenstein* property of $R$ are topological properties of its associated cell complex.

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