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Characterizing polytopes contained in the 0/1-cube with bounded Chvátal-Gomory rank

par Benchetrit, Yohann ;Fiorini, Samuel ;Huynh, Tony ;Weltge, Stefan
Référence Mathematics of operations research, 43, 3
Publication Publié, 2018

Article révisé par les pairs

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Résumé :

Let S ⊂ {0; 1}n and R be any polytope contained in [0; 1]n with R ⊂ {0; 1}n = S. We prove that R has bounded Chvátal-Gomory rank (CG-rank) provided that S has bounded notch and bounded gap, where the notch is the minimum integer p such that all p-dimensional faces of the 0'1-cube have a nonempty intersection with S, and the gap is a measure of the size of the facet coefficients of conv1S°. Let H[S] denote the subgraph of the n-cube induced by the vertices not in S. We prove that if H[S] does not contain a subdivision of a large complete graph, then the notch and the gap are bounded. By our main result, this implies that the CG-rank of R is bounded as a function of the treewidth of H[S]. We also prove that if S has notch 3, then the CG-rank of R is always bounded. Both results generalize a recent theorem of Cornuéjols and Lee [Cornuéjols G, Lee D (2016) On some polytopes contained in the 0,1 hypercube that have a small Chvátal rank. Louveaux Q, Skutella M, eds. Proc. 18th Internat. Conf. Integer Programming Combinatorial Optim., IPCO '16 (Springer International, Cham, Switzerland), 300-311], who proved that the CG-rank is bounded by a constant if the treewidth of H[S] is at most 2.