A geometric deletion-restriction formula

Details A geometric deletion-restriction formula A geometric deletion-restriction formula

2011-10-12

arxiv.org/abs/1110.2799v1

Mathematics

Algebraic Geometry

17 pages

Scientific paper

In this paper, we recover the characteristic polynomial of an arrangement of hyperplanes by computing the rational equivalence class of the variety defined by the logarithmic ideal of the arrangement. The logarithmic ideal was introduced in [arXiv:0907.0896v2] in a study of the critical points of the master function. The above result is used to understand the asymptotic behavior the Hilbert series of the logarithmic ideal. As an application, we prove the Solomon-Terao formula under the tame hypothesis by identifying each side of the formula with a certain specialization of the Hilbert series of the logarithmic ideal.

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