The Computability Path Ordering: The End of a Quest

  • Authors:
  • Frédéric Blanqui;Jean-Pierre Jouannaud;Albert Rubio

  • Affiliations:
  • INRIA, Campus Scientifique, Vandœuvre-lès-Nancy Cedex, France 54506;LIX, Projet INRIA TypiCal, École Polytechnique and CNRS, Palaiseau, France 91400;Technical University of Catalonia, Barcelona, Spain 08028

  • Venue:
  • CSL '08 Proceedings of the 22nd international workshop on Computer Science Logic
  • Year:
  • 2008

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Abstract

In this paper, we first briefly survey automated termination proof methods for higher-order calculi. We then concentrate on the higher-order recursive path ordering, for which we provide an improved definition, the Computability Path Ordering. This new definition appears indeed to capture the essence of computability arguments à la Tait and Girard, therefore explaining the name of the improved ordering.