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Combinatorics and geometry of power ideals. (English) Zbl 1226.05019
Trans. Am. Math. Soc. 362, No. 8, 4357-4384 (2010); corrigendum ibid. 367, No. 5, 3759-3762 (2015).
Summary: We investigate ideals in a polynomial ring which are generated by powers of linear forms. Such ideals are closely related to the theories of fat point ideals, Cox rings, and box splines.
We pay special attention to a family of power ideals that arises naturally from a hyperplane arrangement $$\mathcal{A}$$. We prove that their Hilbert series are determined by the combinatorics of $$\mathcal{A}$$ and can be computed from its Tutte polynomial. We also obtain formulas for the Hilbert series of certain closely related fat point ideals and zonotopal Cox rings.
Our work unifies and generalizes results due to Dahmen-Micchelli, Holtz-Ron, Postnikov-Shapiro-Shapiro, and Sturmfels-Xu, among others. It also settles a conjecture of Holtz-Ron on the spline interpolation of functions on the lattice points of a zonotope.

##### MSC:
 05A15 Exact enumeration problems, generating functions 05B35 Combinatorial aspects of matroids and geometric lattices 13P99 Computational aspects and applications of commutative rings 41A15 Spline approximation 52C35 Arrangements of points, flats, hyperplanes (aspects of discrete geometry)
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