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- W2150872002 abstract "Ordering constraints are formally analogous to instances of the satisfiability problem in conjunctive normal form, but instead of a boolean assignment we consider a linear ordering of the variables in question. A clause becomes true given a linear ordering if and only if the relative ordering of its variables obeys the constraint considered. The naturally arising satisfiability problems are NP-complete for many types of constraints. We look at random ordering constraints. Previous work of the author shows that there is a sharp unsatisfiability threshold for certain types of constraints. The value of the threshold, however, is essentially undetermined. We pursue the problem of approximating the precise value of the threshold. We show that random instances of the betweenness constraint are satisfiable with high probability if the number of randomly picked clauses is ≤0.92 n , where n is the number of variables considered. This improves the previous bound, which is <0.82 n random clauses. The proof is based on a binary relaxation of the betweenness constraint and involves some ideas not used before in the area of random ordering constraints." @default.
- W2150872002 created "2016-06-24" @default.
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- W2150872002 date "2010-10-05" @default.
- W2150872002 modified "2023-10-14" @default.
- W2150872002 title "On Random Betweenness Constraints" @default.
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- W2150872002 doi "https://doi.org/10.1017/s0963548310000313" @default.
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