Combination of convex theories: Modularity, deduction completeness, and explanation

  • Authors:

  • Duc-Khanh Tran;Christophe Ringeissen;Silvio Ranise;Hélène Kirchner

  • Affiliations:

  • Max-Planck-Institut für Informatik, Stuhlsatzenhausweg 85, 66123 Saarbrücken, Germany;LORIAINRIA Nancy - Grand Est, 615, rue du Jardin Botanique, BP 101, 54602 Villers-les-Nancy Cedex, France;Dipartimento di Informatica, Univ. di Verona, Italy;Centre de Recherche INRIA Bordeaux - Sud-Ouest, Bâtiment A29 351, Cours de la Libération 33405 Talence, France

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2010

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Abstract

Decision procedures are key components of theorem provers and constraint satisfaction systems. Their modular combination is of prime interest for building efficient systems, but their effective use is often limited by poor interface capabilities, when such procedures only provide a simple ''sat/unsat'' answer. In this paper, we develop a framework to design cooperation schemas between such procedures while maintaining modularity of their interfaces. First, we use the framework to specify and prove the correctness of classic combination schemas by Nelson-Oppen and Shostak. Second, we introduce the concept of deduction complete satisfiability procedures, we show how to build them for large classes of theories, then we provide a schema to modularly combine them. Third, we consider the problem of modularly constructing explanations for combinations by re-using available proof-producing procedures for the component theories.