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The Orlik-Solomon model for hypersurface arrangements

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arxiv 1302.2103 v3 pith:KFSXYKDI submitted 2013-02-08 math.AG math.ATmath.CO

classification math.AGmath.ATmath.CO
keywords complexhypersurfacemodelarrangementcohomologycomplementorlik-solomonsmooth
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We develop a model for the cohomology of the complement of a hypersurface arrangement inside a smooth projective complex variety. This generalizes the case of normal crossing divisors, discovered by P. Deligne in the context of the mixed Hodge theory of smooth complex varieties. Our model is a global version of the Orlik-Solomon algebra, which computes the cohomology of the complement of a union of hyperplanes in an affine space. The main tool is the complex of logarithmic forms along a hypersurface arrangement, and its weight filtration. Connections with wonderful compactifications and the configuration spaces of points on curves are also studied.

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  1. From Regions to Hodge Structures: The Topological Study of semialgebraic Curves Configurations

    math.AG 2026-07 reject novelty 6.5 of 10

    The node contribution psi determines region counts and deletion-restriction for ordinary curve arrangements, equals dim Gr_4^W H^2 for line arrangements, and the simplified OS defect is sum binom(k_x-1,2) over nodes w...

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