manuscripta mathematica

, Volume 61, Issue 4, pp 447–458

On 2-spannedness for the adjunction mapping

Authors

  • E. Ballico
    • Dipartimento di MatematicaUniversità di Trento
  • M. Beltrametti
    • Dipartimento di MatematicaUniversità di Genova
Article

DOI: 10.1007/BF01258599

Cite this article as:
Ballico, E. & Beltrametti, M. Manuscripta Math (1988) 61: 447. doi:10.1007/BF01258599
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Abstract

LetL be a line bundle on a smooth connected projective manifold X of dimension n. We extend to any dimension the definition of k-spannedness forL; this is a notion of “k-th order embedding” which was recently given in the case of curves and surfaces. Then, by a reduction to the surfaces case, we prove that the adjoint bundle Kx+(n−1)L is 2-spanned ifL is (at least) 3-spanned.

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© Springer-Verlag 1988