On sufficient conditions for unsatisfiability of random formulas.

A descriptive complexity approach to random 3-SAT is initiated. We show that unsatisfiability of any significant fraction of random 3-CNF formulas cannot be certified by any property that is expressible in Datalog. Combined with the known relationship between the complexity of constraint satisfactio...

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Vydáno v:	Journal of the ACM 51, 2 (2004).
Hlavní autor:	Atserias, Albert
Médium:	Článek
Jazyk:	English
Témata:	Theory of computation. Analysis of algorithms and problem complexity. Nonnumerical algorithms and problems. Complexity of proof procedures. Mathematical logic and formal languages. Mathematical logic. Logic and constraint programming. Theory.