A Continuous-Discontinuous Second-Order Transition in the Satisfiability of Random Horn-SAT Formulas

Cristopher Moore; Gabriel Istrate; Demetrios Demopoulos; Moshe Y. Vardi

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A Continuous-Discontinuous Second-Order Transition in the Satisfiability of Random Horn-SAT Formulas

Cristopher Moore·Gabriel Istrate·Demetrios Demopoulos·Moshe Y. Vardi

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Abstract

We compute the probability of satisfiability of a class of random Horn-SAT formulae, motivated by a connection with the nonemptiness problem of finite tree automata. In particular, when the maximum clause length is 3, this model displays a curve in its parameter space along which the probability of satisfiability is discontinuous, ending in a second-order phase transition where it becomes continuous. This is the first case in which a phase transition of this type has been rigorously established for a random constraint satisfaction problem.

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Cristopher Moore, Gabriel Istrate, Demetrios Demopoulos, Moshe Y. Vardi. 2005-05-02. A Continuous-Discontinuous Second-Order Transition in the Satisfiability of Random Horn-SAT Formulas. https://arxiv.org/abs/math/0505032

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