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The Speciality Lemma, Rank 2 Bundles and Gherardelli-type Theorems for Surfaces in P4
Published online by Cambridge University Press: 04 December 2007
Abstract
In the present paper we give a very short and easy proof of the speciality lemma for codimension 2 subvarieties, even those that are reducible or non-reduced, in Pn. Furthermore we give cohomological conditions that force a subcanonical surface in P4 to be a complete intersection and a rank 2 bundle to split, which generalize the classical First Theorem of Gherardelli.
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- Research Article
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- © 2003 Kluwer Academic Publishers
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