swMATH ID: 9578
Software Authors: Armin Biere, Florian Lonsing, Martina Seidl
Description: Blocked clause elimination for QBF. Quantified Boolean formulas (QBF) provide a powerful framework for encoding problems from various application domains, not least because efficient QBF solvers are available. Despite sophisticated evaluation techniques, the performance of such a solver usually depends on the way a problem is represented. However, the translation to processable QBF encodings is in general not unique and may either introduce variables and clauses not relevant for the solving process or blur information which could be beneficial for the solving process. To deal with both of these issues, preprocessors have been introduced which rewrite a given QBF before it is passed to a solver. In this paper, we present novel preprocessing methods for QBF based on blocked clause elimination (BCE), a technique successfully applied in SAT. Quantified blocked clause elimination (QBCE) allows to simulate various structural preprocessing techniques as BCE in SAT. We have implemented QBCE and extensions of QBCE in the preprocessor bloqqer. In our experiments we show that preprocessing with QBCE reduces formulas substantially and allows us to solve considerable more instances than the previous state-of-the-art
Homepage: http://fmv.jku.at/bloqqer/
Related Software: DepQBF; MiniSat; sQueezeBF; Quaffle; semprop; CAQE; Nenofex; QUBOS; Quantor; Lingeling; sKizzo; PicoSAT; QUBE; QBFLIB; QRATPre+; HQSpre; DRAT-trim; ABC; Treengeling; Plingeling
Cited in: 31 Publications

Standard Articles

1 Publication describing the Software, including 1 Publication in zbMATH Year
Blocked clause elimination for QBF. Zbl 1341.68181
Biere, Armin; Lonsing, Florian; Seidl, Martina

Citations by Year