Abstract.
We prove an inequality, conjectured by Kalai, relating the g-polynomials of a polytope P, a face F, and the quotient polytope P/F, in the case where P is rational. We introduce a new family of polynomials g(P,F), which measures the complexity of the part of P“far away” from the face F; Kalai's conjecture follows from the nonnegativity of these polynomials. This nonnegativity comes from showing that the restriction of the intersection cohomology sheaf on a toric variety to the closure of an orbit is a direct sum of intersection homology sheaves.
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Received: June 30, 1998.
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Braden, T., MacPherson, R. Intersection homology of toric varieties and a conjecture of Kalai. Comment. Math. Helv. 74, 442–455 (1999). https://doi.org/10.1007/s000140050098
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DOI: https://doi.org/10.1007/s000140050098