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The Hibi-Li Face-Number Conjecture

Ghislain Fourier

Source record

Source: arXiv

Published: Sep 20, 2026

arXiv: 2609.23629

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Source abstract

We prove the face-number conjecture of Hibi and Li: for every finite poset, the order polytope has no more faces of any given dimension than the chain polytope. More generally, the face numbers increase weakly along the admissible family of chain-order polytopes when one order coordinate is replaced by a chain coordinate.

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