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arXiv · 1504.01706

Order-Chain Polytopes

Takayuki Hibi·Nan Li·Teresa Xueshan Li·Lili Mu·Akiyoshi Tsuchiya
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Abstract

Given two families $X$ and $Y$ of integral polytopes with nice combinatorial and algebraic properties, a natural way to generate new class of polytopes is to take the intersection $\mathcal{P}=\mathcal{P}_1\cap\mathcal{P}_2$, where $\mathcal{P}_1\in X$, $\mathcal{P}_2\in Y$. Two basic questions then arise: 1) when $\mathcal{P}$ is integral and 2) whether $\mathcal{P}$ inherits the "old type" from $\mathcal{P}_1, \mathcal{P}_2$ or has a "new type", that is, whether $\mathcal{P}$ is unimodularly equivalent to some polytope in $X\cup Y$ or not. In this paper, we focus on the families of order polytopes and chain polytopes and create a new class of polytopes following the above framework, which are named order-chain polytopes. In the study on their volumes, we discover a natural relation with Ehrenborg and Mahajan's results on maximizing descent statistics.

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Takayuki Hibi, Nan Li, Teresa Xueshan Li, Lili Mu, Akiyoshi Tsuchiya. 2015-04-07. Order-Chain Polytopes. https://arxiv.org/abs/1504.01706

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