Complexity of Propositional Proofs Under a Promise

Abstract. We study – within the framework of propositional proof complexity – the problem of certifying unsatisfiability of CNF formulas under the promise that any satisfiable formula has many satisfying assignments, where “many” stands for an explicitly specified function Λ in the number of variables n. To this end, we develop propositional proof systems under different measures of promises (that is, different Λ) as extensions of resolution. This is done by augmenting resolution with axioms that, roughly, can eliminate sets of truth assignments defined by Boolean circuits. We then investigate the complexity of such systems, obtaining an exponential separation in the average-case between resolution under different size promises: (1) Resolution has polynomial-size refutations for all unsatisfiable 3CNF formulas when the promise is ε·2n

• Type: Conference
• Year: 2007
• Where: ICALP
• Authors: Nachum Dershowitz, Iddo Tzameret
• Keywords: ICALP 2007, Propositional Proof, Propositional Proof Complexity, Propositional Proof Systems, Theoretical Computer Science