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• W2918119152 abstract "We introduce proof systems for propositional logic that admit short proofs of hard formulas as well as the succinct expression of most techniques used by modern SAT solvers. Our proof systems allow the derivation of clauses that are not necessarily implied, but which are redundant in the sense that their addition preserves satisfiability. To guarantee that these added clauses are redundant, we consider various efficiently decidable redundancy criteria which we obtain by first characterizing clause redundancy in terms of a semantic implication relationship and then restricting this relationship so that it becomes decidable in polynomial time. As the restricted implication relation is based on unit propagation-a core technique of SAT solvers-it allows efficient proof checking too. The resulting proof systems are surprisingly strong, even without the introduction of new variables-a key feature of short proofs presented in the proof-complexity literature. We demonstrate the strength of our proof systems on the famous pigeon hole formulas by providing short clausal proofs without new variables." @default.
• W2918119152 created "2019-03-02" @default.
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• W2918119152 date "2019-02-22" @default.
• W2918119152 modified "2023-09-28" @default.
• W2918119152 title "Strong Extension-Free Proof Systems" @default.
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• W2918119152 doi "https://doi.org/10.1007/s10817-019-09516-0" @default.
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