Ehrhart positivity
Introductory Workshop: Geometric and Topological Combinatorics September 05, 2017 - September 08, 2017
Location: SLMath: Eisenbud Auditorium
Ehrhart positivity
McMullen's formula
integral polytope
Berline-Vergne valuations
49K45 - Optimality conditions for problems involving randomness [See also 93E20]
49L25 - Viscosity solutions to Hamilton-Jacobi equations in optimal control and differential games
8-Liu
We say a polytope is Ehrhart positive if its Ehrhart polynomial has positive coefficients. There are different examples of polytopes shown to be Ehrhart positive using different techniques. We will survey some of these results. Through work of Danilov/McMullen, there is an interpretation of Ehrhart coefficients relating to the normalized volumes of faces. We try to make this relation more explicit in the particular case of the regular permutohedron. The goal is to prove Ehrhart positivity for generalized permutohedra. If time permits, I will also discuss some related questions. This is joint work with Federico Castillo.
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8-Liu
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