Limiting Partial Combinatory Algebras towards Infinitary Lambda-Calculi and Classical Logic

  • Authors:
  • Yohji Akama

  • Affiliations:
  • -

  • Venue:
  • CSL '01 Proceedings of the 15th International Workshop on Computer Science Logic
  • Year:
  • 2001

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Abstract

We will construct from every partial combinatory algebra (PCA, for short) A a PCA a-lim(A) s.t. (1) every representable numeric function ϕ(n) of a-lim(A) is exactly of the form limt ξ(t, n) with ξ(t, n) being a representable numeric function of A, and (2) A can be embedded into a-lim(A) which has a synchronous application operator. Here, a-lim(A) is A equipped with a limit structure in the sense that each element of a-lim(A) is the limit of a countable sequence of A-elements. We will discuss limit structures for A in terms of Barendregt's range property. Moreover, we will repeat the construction lim(--) transfinite times to interpret infinitary λ-calculi. Finally, we will interpret affine type-free λµ-calculus by introducing another partial applicative structure which has an asynchronous application operator and allows a parallel limit operation.