Geodesic
On relaxation polytope of 3-satisfiability problem
Modelirovanie i analiz informacionnyh sistem, Tome 14 (2007) no. 2, pp. 7-11

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The properties of a polytope associated with the 3-satisfiability problem are investigated. Particularly, we prove that values of its vertice coordinates can be represented by fractions with arbitrarily large denominators. 
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     author = {B. V. Uryvaev},
     title = {On relaxation polytope of 3-satisfiability problem},
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B. V. Uryvaev. On relaxation polytope of 3-satisfiability problem. Modelirovanie i analiz informacionnyh sistem, Tome 14 (2007) no. 2, pp. 7-11. http://geodesic.mathdoc.fr/item/MAIS_2007_14_2_a1/