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Pencils of curves on smooth surfaces

By Alejandro Melle Hernández and Charles Terence Clegg Wall

Abstract

Although the theory of singularities of curves - resolution, classification, numerical invariants - goes through with comparatively little change in finite characteristic, pencils of curves are more difficult. Bertini's theorem only holds in a much weaker form, and it is convenient to restrict to pencils such that, when all base points are resolved, the general member of the pencil becomes non-singular. Even here, the usual rule for calculating the Euler characteristic of the resolved surface has to be modified by a term measuring wild ramification. \ud We begin by describing this background, then proceed to discuss the exceptional members of a pencil. In characteristic 0 it was shown by Há and Lê and by Lê and Weber, using topological reasoning, that exceptional members can be characterised by their Euler characteristics. We present a combinatorial argument giving a corresponding result in characteristic p. We first treat pencils with no base points, and then reduce the remaining case to this.\u

Topics: Geometria algebraica
Publisher: Oxford University Press (OUP)
Year: 2001
DOI identifier: 10.1112/plms
OAI identifier: oai:www.ucm.es:13210
Provided by: EPrints Complutense

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