Even sets of four nodes on rational surfaces

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We describe smooth rational projective algebraic surfaces X, over an algebraically closed field of characteristic different from 2, having an even set of four disjoint (-2)-curves N_1,...,N_4, i.e. such that N_1+...+N_4 is divisible by 2 in Pic(X).
9 pages

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Algebraic Geometry, 14J26

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http://salesiana.dossiersoluciones.com/handle/123456789/71890

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0407250
 http://arxiv.org/abs/math/0407250

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arXiv