A new characterization of lambda definability

  • Achim Jung
  • Jerzy Tiuryn
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 664)


We give a new characterization of lambda definability in Henkin models using logical relations defined over ordered sets with varying arity. The advantage of this over earlier approaches by Plotkin and Statman is its simplicity and universality. Yet, decidability of lambda definability for hereditarily finite Henkin models remains an open problem. But if the variable set allowed in terms is also restricted to be finite then our techniques lead to a decision procedure.


Normal Form Induction Hypothesis Free Variable Fundamental Theorem Logical Relation 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Achim Jung
    • 1
  • Jerzy Tiuryn
    • 2
  1. 1.Fachbereich MathematikTechnische Hochschule DarmstadtDarmstadtGermany
  2. 2.Instytut InformatykiUniwersytet WarszawskiWarszawaPoland

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