Picard-graded Betti numbers and the defining ideals of Cox rings

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Let X be a smooth projective variety with torsion-free Picard group. We introduce complexes of vector spaces whose homology determines the structure of the minimal free resolution of the Cox ring of X over the polynomial ring and show how the homology of these complexes can be studied by purely geometric methods. As an application of these techniques we give a simple new proof of a characterization of the Cox rings of Del Pezzo surfaces (of degree >1) conjectured by Batyrev and Popov.
21 pages, 3 figures

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Algebraic Geometry, Commutative Algebra

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http://salesiana.dossiersoluciones.com/handle/123456789/134829

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0707.3251
 http://arxiv.org/abs/0707.3251

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arXiv