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Castillo–Liu conjecture on Ehrhart positivity of generalized permutohedra
About 6 years old
Castillo–Liu conjecture. Every integral generalized permutohedron $\mathscr{P}$ is Ehrhart positive.
opencombinatorics ehrhart-theory generalized-permutohedra
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Castillo–Liu conjecture on Ehrhart positivity of generalized permutohedra