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Exponents of some one-dimensional Gauss-Manin cohomologies

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arxiv 1504.08214 v5 pith:THXYRORH submitted 2015-04-30 math.AG

Exponents of some one-dimensional Gauss-Manin cohomologies

classification math.AG
keywords exponentsgauss-manincohomologiesone-dimensionalsomealgebraicapplicationarrangements
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In this paper we provide a purely algebraic characterization of the exponents of one-dimensional direct images of a structure sheaf by a rational function, related to the vanishing of the cohomologies of a certain Koszul complex associated with such a morphism. This can be extended to a more general family of Gauss-Manin systems. As an application, we calculate a set of possible exponents of the Gauss-Manin cohomology of some arrangements of hyperplanes with multiplicities, relevant to Dwork families and mirror symmetry.

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