Discriminant loci of ample and spanned line bundles |
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Authors: | A. Lanteri |
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Affiliation: | a Dipartimento di Matematica “F. Enriques”, Università, Via C. Saldini 50, I-20133 Milano, Italy b Departamento de Matemática Aplicada, Universidad Rey Juan Carlos, Calle Tulipán, 28933- Móstoles, Madrid, Spain |
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Abstract: | Let (X,L,V) be a triplet where X is an irreducible smooth complex projective variety, L is an ample and spanned line bundle on X and V⊆H0(X,L) spans L. The discriminant locus D(X,V)⊂|V| is the algebraic subset of singular elements of |V|. We study the components of D(X,V) in connection with the jumping sets of (X,V), generalizing the classical biduality theorem. We also deal with the degree of the discriminant (codegree of (X,L,V)) giving some bounds on it and classifying curves and surfaces of codegree 2 and 3. We exclude the possibility for the codegree to be 1. Significant examples are provided. |
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Keywords: | Primary, 14C20, 14N05 secondary, 14F05 |
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