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Proof systems for SAT are unsound for MaxSAT because they preserve satisfiability but fail to preserve the minimum number of unsatisfied clauses. Consequently, there has been a need to define cost-preserving resolution-style proof systems for MaxSAT. In this paper, we present the first MaxSAT resolution proof system specifically defined for regular propositional clausal forms and prove its soundness and completeness. The defined proof system provides an exact approach to solving Regular MaxSAT and Weighted Regular MaxSAT with variable elimination algorithms.
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