Complexity of many-valued logics

  • Authors:
  • Reiner Hähnle

  • Affiliations:
  • Chalmers University of Technology, Dept. of Computing Science, S-41296 Gothenburg, Sweden

  • Venue:
  • Beyond two
  • Year:
  • 2003

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Abstract

As is the case for other logics, a number of complexity-related questions can be posed in the context of many-valued logic. Some of these, such as the complexity of the sets of satisfiable and valid formulas in various logics, are completely standard; others only make sense in a many-valued context. In this overview I concentrate on two kinds of complexity problems related to many-valued logic: first, I discuss the complexity of the membership problem in various languages, such as the satisfiable, respectively, the valid formulas in some well-known logics. Second, I discuss the size of representations of many-valued connectives and quantifiers, because this has a direct impact on the complexity of many kinds of deduction systems. I include results on both propositional and on first-order logic.