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arXiv 0801.3512math.AG
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一类线性布置的容许局部系统

Admissible local systems for a class of line arrangements

Shaheen Nazir, Zahid Raza

摘要:

如果上同调群$H^m(M,\LL)$的维数可直接由上同调代数$H^*(M,\C)$计算,则光滑复代数簇$M$上的秩为1的局部系统$\LL$是可容许的.如果$k \ge 0 $是$\A$中包含所有重数至少为3的点的最小行数,则我们说行排列$\A$是$\CC_k$类型。我们证明了如果$\A$是$k\leq 2$的类$\CC_k$中的线排列,则在线排列补$M$上的任何秩为1的局部系统$\LL$都是容许的.部分结果得到类$\CC_3$。

英文摘要:

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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