New paper: Toric h-vectors and Chow Betti Numbers of Dual Hypersimplices

Toric h-vectors and Chow Betti Numbers of Dual Hypersimplices
by Charles Wang and Josephine Yu

Abstract: The toric h-numbers of a dual hypersimplex and the Chow Betti numbers of the normal fan of a hypersimplex are the ranks of intersection cohomology and Chow cohomology respectively of the torus orbit closure of a generic point in the Grassmannian. We give explicit formulas for these numbers. We also show that similar formulas hold for the coordinator numbers of type A^* lattices.

http://front.math.ucdavis.edu/1707.04581

 

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