Some remarks on varieties with degenerate Gauss image

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We consider projective varieties with degenerate Gauss image whose focal hypersurfaces are non-reduced schemes. Examples of this situation are provided by the secant varieties of Severi and Scorza varieties. The Severi varieties are moreover characterized by a uniqueness property.
9 pages, to be published in Pacific Journal of Mathematics

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Algebraic Geometry, Differential Geometry, 14N20, 14J30

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http://salesiana.dossiersoluciones.com/handle/123456789/67033

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0304127
 http://arxiv.org/abs/math/0304127

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arXiv