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CONES OF CURVES AND OF LINE BUNDLES ON SURFACES ASSOCIATED WITH CURVES HAVING ONE PLACE AT INFINITY

Published online by Cambridge University Press:  29 April 2002

ANTONIO CAMPILLO
Affiliation:
Departamento de Álgebra y Geometría, Facultad Ciencias, Universidad de Valladolid, E-47005 Valladolid, Spain. campillo@agt.uva.es, areguera@agt.uva.es
OLIVIER PILTANT
Affiliation:
Centre de Mathématiques, École Polytechnique, F-91128 Palaiseau Cedex, France. piltant@math.polytechnique.fr
ANA J. REGUERA-LÓPEZ
Affiliation:
Departamento de Álgebra y Geometría, Facultad Ciencias, Universidad de Valladolid, E-47005 Valladolid, Spain. campillo@agt.uva.es, areguera@agt.uva.es
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Abstract

Let V be a pencil of curves in ${\bf P}^2$ with one place at infinity, and $X \longrightarrow {\bf P}^2$ the minimal composition of point blow-ups eliminating its base locus. We study the cone of curves and the cones of numerically effective and globally generated line bundles on X. It is proved that all of these cones are regular. In particular, this result provides a new class of rational projective surfaces with a rational polyhedral cone of curves. The surfaces in this class have non-numerically effective anticanonical sheaf if the pencil is neither rational nor elliptic. An application is a global version on X of Zariski's unique factorization theorem for complete ideals. We also define invariants of the semigroup of globally generated line bundles on X depending only on the topology of V at infinity.

2000 Mathematical Subject Classification: primary 14C20; secondary 14E05.

Type
Research Article
Copyright
2002 London Mathematical Society

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