Projective normality of special scrolls II

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We study the projective normality of a linearly normal special scroll R of degree d and speciality i over a smooth curve X of genus g. We relate it with the Clifford index of the base curve X. If d>=4g-2i-Cliff(X)+1, i>=3 and R is smooth, we prove that the projective normality of the scroll is equivalent to the projective normality of its directrix curve of minimum degree.
7 pages

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Algebraic Geometry, Primary, 14J26; secondary, 14H25,14H45. 14H45

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http://salesiana.dossiersoluciones.com/handle/123456789/63741

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0204091
 http://arxiv.org/abs/math/0204091

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arXiv