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arXiv 1108.3871math.CO
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射影排列的奇异向量的反变形式

The contravariant form on singular vectors of a projective arrangement

Michael J. Falk, Alexander N. Varchenko

摘要:

对于射影空间中的超平面排列A,我们定义了一个标志空间和奇异向量空间,A --> C具有一个权系a。我们表明,逆变双线性型相应的加权中心安排,导致一个定义良好的形式上的奇异向量空间的投影。如果A中的权重a(H),H之和为零,则该形式自然同构于对从A通过关于其超平面之一的逆变换而获得的任何仿射排列的逆变形式的奇异向量空间的限制。

英文摘要:

We define the flag space and space of singular vectors for an arrangement A of hyperplanes in projective space equipped with a system of weights a: A --> C. We show that the contravariant bilinear form of the corresponding weighted central arrangement induces a well-defined form on the space of singular vectors of the projectivization. If the sum of the weights a(H), H in A, is zero, then this form is naturally isomorphic to the restriction to the space of singular vectors of the contravariant form of any affine arrangement obtained from A by dehomogenizing with respect to one of its hyperplanes.

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