Bounds on leaves of one-dimensional foliations

Details Bounds on leaves of one-dimensional foliations Bounds on leaves of one-dimensional foliations

2002-09-11

arxiv.org/abs/math/0209113v1

Mathematics

Algebraic Geometry

18 pages, AMSLaTeX

Scientific paper

Let X be a variety over an algebraically closed field, \eta:\Omega^1_X\to L a one-dimensional singular foliation, and C\subseteq X a projective leaf of \eta. We prove that 2p_a(C)-2=\deg(L|C)+\lambda(C)-\deg(C\cap S) where p_a(C) is the arithmetic genus, where \lambda(C) is the colength in the dualizing sheaf of the subsheaf generated by the K\"ahler differentials, and where S is the singular locus of \eta. We bound \lambda(C) and \deg(C\cap S), and then improve and extend some recent results of Campillo, Carnicer, and de la Fuente, and of du Plessis and Wall.

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