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Global optimization for satisfiability (SAT) problem

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1 Author(s)
Jun Gu ; Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada

The satisfiability (SAT) problem is a fundamental problem in mathematical logic, inference, automated reasoning, VLSI engineering, and computing theory. Following CNF and DNF local search methods, we introduce the Universal SAT problem model, UniSAT, which transforms the discrete SAT problem on Boolean space {0, 1}m into an unconstrained global optimization problem on real space Em. A direct correspondence between the solution of the SAT problem and the global minimum point of the UniSAT objective function is established. Many existing global optimization algorithms can be used to solve the UniSAT problems. Combined with backtracking/resolution procedures, a global optimization algorithm is able to verify satisfiability as well as unsatisfiability. This approach achieves significant performance improvements for certain classes of conjunctive normal form (CNF) formulas. It offers a complementary approach to the existing SAT algorithms

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:6 ,  Issue: 3 )