Gomory-Chvátal cuts are prominent in integer programming. The Gomory-Chvátal closure of a polyhedron is the intersection of all half spaces defined by its Gomory-Chvátal cuts. In this paper, we show that it is NP-complete to decide whether the Gomory-Chvátal closure of a rational polyhedron is empty, even when this polyhedron contains no integer point. This implies that the problem of deciding whether the Gomory-Chvátal closure of a rational polyhedron P is identical to the integer hull of P is NP-hard. Similar results are also proved for the {−1, 0, 1}-cuts and {0, 1}-cuts, two special types of Gomory-Chvátal cuts with coefficients restricted in {−1, 0, 1} and {0, 1}, respectively.
CITATION STYLE
Cornuéjols, G., & Li, Y. (2016). Deciding emptiness of the Gomory-Chvátal closure is NP-complete, even for a rational polyhedron containing no integer point. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 9682, pp. 387–397). Springer Verlag. https://doi.org/10.1007/978-3-319-33461-5_32
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