Toward Leaner Binary-Clause Reasoning in a Satisfiability Solver

  • Authors:
  • Allen Van Gelder

  • Affiliations:
  • Computer Science Department, SOE, University of California, Santa Cruz, CA 95064, USA E-mail: avg@cs.ucsc.edu

  • Venue:
  • Annals of Mathematics and Artificial Intelligence
  • Year:
  • 2005

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Abstract

Binary-clause reasoning has been shown to reduce the size of the search space on many satisfiability problems, but has often been so expensive that run-time was higher than that of a simpler procedure that explored a larger space. The method of Sharir for detecting strongly connected components in a directed graph can be adapted to performing “lean” resolution on a set of binary clauses. Beyond simply detecting unsatisfiability, the goal is to find implied equivalent literals, implied unit clauses, and implied binary clauses.