Birational rigidity is not an open property

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We construct an example of the birationally rigid complete intersection of a quadric and a cubic in $\PA^5$ with an ordinary double point, which under a small deformation gives a non-rigid Fano variety. Thus we show that birational rigidity is not open in moduli.
26 pages

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Algebraic Geometry, 14E05; 14E07

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http://salesiana.dossiersoluciones.com/handle/123456789/119857

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0612159
 http://arxiv.org/abs/math/0612159

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arXiv