Reduction-free normalisation for a polymorphic system

  • Authors:
  • Thorsten Altenkirch;Martin Hofmann;Thomas Streicher

  • Affiliations:
  • -;-;-

  • Venue:
  • LICS '96 Proceedings of the 11th Annual IEEE Symposium on Logic in Computer Science
  • Year:
  • 1996

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Abstract

We give a semantical proof that every term of a combinator version of system F has a normal form. As the argument is entirely formalisable in an impredicative constructive type theory a reduction-free normalisation algorithm can be extracted from this. The proof is presented as the construction of a model of the calculus inside a category of presheaves. Its definition is given entirely in terms of the internal language.