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Volume 13 / Issue 4

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DOI:   10.3217/jucs-013-04-0572


Random k-GD-Sat Model and its Phase Transition

Milena Vujošević-Janičić (University of Belgrade, Serbia)

Jelena Tomašević (University of Belgrade, Serbia)

Predrag Janičić (University of Belgrade, Serbia)

Abstract: We present a new type of sat problem called the k-GD-SAT, which generalizes k-sat and GD-sat. In k-GD-SAT, clause lengths have geometric distribution, controlled by a probability parameter p; for p = 1, a k-GD-SAT problem is a k-SAT problem. We report on the phase transition between satisfiability and unsatisfiability for randomly generated instances of k-GD-SAT. We provide theoretical analysis and experimental results suggesting that there is an intriguing relationship (linear in the parameter 1/p) between crossover points for different parameters of k-GD-SAT. We also consider a relationship between crossover points for k-SAT and k-GD-SAT and provide links between these values.

Keywords: npcomplete problems, phase transition, propositional satisfiability, random sat problems

Categories: F.2.2, F.4.1, I.6.4