Learnability of quantified formulas

  • Authors:
  • Victor Dalmau;Peter Jeavons

  • Affiliations:
  • Department de tecnologia, Universitat Pompeu Fabra, Estació de França, Passeig de la circumval.lacio 8, 08003 Barcelona, Spain;Computing Laboratory, Oxford University, Wolfson Building, Parks Road, Oxford, OX1 3QD, UK

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2003

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Abstract

We consider the following classes of quantified formulas. Fix a set of basic relations called a basis. Take conjunctions of these basic relations applied to variables and constants in arbitrary ways. Finally, quantify existentially or universally some of the variables. We introduce some conditions on the basis that guarantee efficient learnability. Furthermore, we show that with certain restrictions on the basis the classification is complete. We introduce, as an intermediate tool, a link between this class of quantified formulas and some well-studied structures in Universal Algebra called clones. More precisely, we prove that the computational complexity of the learnability of these formulas is completely determined by a simple algebraic property of the basis of relations: their clone of polymorphisms. Finally, we use this technique to give a simpler proof of the already known dichotomy theorem over Boolean domains.