Journal on Satisfiability, Boolean Modeling and Computation ISSN: 1574-0617

JSAT is an open access peer reviewed journal, publishing high quality original research papers and survey papers which evidently contribute to deeper insight. It is an electronic medium, guaranteeing fast publication.

JSAT volume 12

Volume for papers published in 2020.

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Table of Contents

Backdoors into Two Occurrences, Jan Johannsen, 1-15. Backdoor set fixed-parameter tractability parameterized complexity completeness formulas with two variable occurrences
Abstract: Backdoor sets for the class CNF(2) of CNF-formulas in which every variable has at most two occurrences are studied in terms of parameterized complexity. The question whether there exists a CNF(2)-backdoor set of size k is hard for the class W[2] , for both weak and strong backdoors, and in both cases it becomes fixed-parameter tractable when restricted to inputs in d-CNF for a fixed d . Besides that, it is shown that the problem of finding weak backdoor sets is W[2]-complete, for certain tractable cases. These are the first completeness results in lower levels of the W-hierarchy for any backdoor set problems.
Polarity and Variable Selection Heuristics for SAT-based Anytime MaxSAT System Description, Alexander Nadel, 17-22. SAT MAXSAT Heuristics
Abstract: This paper is a system description of the anytime MaxSAT solver TT-Open-WBO-Inc, which won both of the weighted incomplete tracks of MaxSAT Evaluation 2019. We implemented the recently introduced polarity and variable selection heuristics, TORC and TSB, respectively, in the Open-WBO-Inc-BMO algorithm within the open-source anytime MaxSAT solver Open-WBO-Inc. As a result, the solver is substantially more efficient.