On contractible curves on normal surfaces

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We characterize contractible curves on proper normal algebraic surfaces in terms of complementary Weil divisors. Using this we generalize the classical criteria of Castelnuovo and Artin. As application we derive a finiteness result on homogeneous spectra defined by Weil divisors on surfaces.
20 pages, submitted to J. Reine Angew. Math

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Algebraic Geometry, 14C20, 14E10, 14J05, 14J17

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http://salesiana.dossiersoluciones.com/handle/123456789/79418

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/9911119
 http://arxiv.org/abs/math/9911119
 J. reine angew. Math. 524, 1-15 (2000)

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arXiv