A Modular Type-Checking Algorithm for Type Theory with Singleton Types and Proof Irrelevance

  • Authors:
  • Andreas Abel;Thierry Coquand;Miguel Pagano

  • Affiliations:
  • Ludwig-Maximilians-Universität München,;Göteborg University,;Universidad Nacional de Córdoba,

  • Venue:
  • TLCA '09 Proceedings of the 9th International Conference on Typed Lambda Calculi and Applications
  • Year:
  • 2009

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Abstract

We define a logical framework with singleton types and one universe of small types. We give the semantics using a PER model; it is used for constructing a normalisation-by-evaluation algorithm. We prove completeness and soundness of the algorithm; and get as a corollary the injectivity of type constructors. Then we give the definition of a correct and complete type-checking algorithm for terms in normal form. We extend the results to proof-irrelevant propositions.