Admissible local systems for a class of line arrangements

Details Admissible local systems for a class of line arrangements Admissible local systems for a class of line arrangements

2008-01-23

arxiv.org/abs/0801.3512v2

Mathematics

Algebraic Geometry

9 pages, 2figures

Scientific paper

A rank one local system $\LL$ on a smooth complex algebraic variety $M$ is admissible roughly speaking if the dimension of the cohomology groups $H^m(M,\LL)$ can be computed directly from the cohomology algebra $H^*(M,\C)$. We say that a line arrangement $\A$ is of type $\CC_k$ if $k \ge 0 $ is the minimal number of lines in $\A$ containing all the points of multiplicity at least 3. We show that if $\A$ is a line arrangement in the classes $\CC_k$ for $k\leq 2$, then any rank one local system $\LL$ on the line arrangement complement $M$ is admissible. Partial results are obtained for the class $\CC_3$.

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