Publication Date

2018

Journal or Book Title

The Electronic Journal of Combinatorics

Abstract

The Turán hypergraph problem asks to find the maximum number of r-edges in a r-uniform hypergraph on n vertices that does not contain a clique of size a. When r=2, i.e., for graphs, the answer is well-known and can be found in Turán's theorem. However, when r ≥ 3, the problem remains open. We model the problem as an integer program and call the underlying polytope the Turán polytope. We draw parallels between the latter and the stable set polytope: we show that generalized and transformed versions of the web and wheel inequalities are also facet-defining for the Turán polytope. We also show that clique inequalities and what we call doubling inequalities are facet-defining when r=2. These facets lead to a simple new polyhedral proof of Turán's theorem.

Volume

25

Issue

3

License

UMass Amherst Open Access Policy

Creative Commons License

Creative Commons Attribution-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-No Derivative Works 4.0 License.

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