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 ΣHεA a(H) = 0, 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.
CITATION STYLE
Falk, M. J., & Varchenko, A. N. (2012). The contravariant form on singular vectors of a projective arrangement. In Configuration Spaces: Geometry, Combinatorics and Topology (pp. 255–272). Scuola Normale Superiore. https://doi.org/10.1007/978-88-7642-431-1_11
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