Nominal techniques in Isabelle/HOL

  • Authors:
  • Christian Urban;Christine Tasson

  • Affiliations:
  • Ludwig-Maximilians-University Munich;ENS Cachan Paris

  • Venue:
  • CADE' 20 Proceedings of the 20th international conference on Automated Deduction
  • Year:
  • 2005

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Abstract

In this paper we define an inductive set that is bijective with the α-equated lambda-terms. Unlike de-Bruijn indices, however, our inductive definition includes names and reasoning about this definition is very similar to informal reasoning on paper. For this we provide a structural induction principle that requires to prove the lambda-case for fresh binders only. The main technical novelty of this work is that it is compatible with the axiom-of-choice (unlike earlier nominal logic work by Pitts et al); thus we were able to implement all results in Isabelle/HOL and use them to formalise the standard proofs for Church-Rosser and strong-normalisation.