Monadic Presentations of Lambda Terms Using Generalized Inductive Types

  • Authors:
  • Thorsten Altenkirch;Bernhard Reus

  • Affiliations:
  • -;-

  • Venue:
  • CSL '99 Proceedings of the 13th International Workshop and 8th Annual Conference of the EACSL on Computer Science Logic
  • Year:
  • 1999

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Abstract

We present a definition of untyped λ-terms using a heterogeneous datatype, i.e. an inductively defined operator. This operator can be extended to a Kleisli triple, which is a concise way to verify the substitution laws for λ-calculus. We also observe that repetitions in the definition of the monad as well as in the proofs can be avoided by using well-founded recursion and induction instead of structural induction. We extend the construction to the simply typed λ-calculus using dependent types, and show that this is an instance of a generalization of Kleisli triples. The proofs for the untyped case have been checked using the LEGO system.