Typed homomorphic relations extended with subtypes

  • Gary T. Leavens
  • Don Pigozzi
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 598)


Typed homomorphic relations on heterogeneous algebras are generalized to allow relationships between elements in the carrier sets of different types. Such relations are needed for the model theory of incomplete, hierarchical specifications with subtypes. Typed logical relations are generalized similarly. These tools help give a simple model-theoretic account of subtyping among abstract data types as observed by terms of a simply-typed lambda-calculus with subtypes.


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Gary T. Leavens
    • 1
  • Don Pigozzi
    • 2
  1. 1.Department of Computer ScienceIowa State UniversityAmesUSA
  2. 2.Department of MathematicsIowa State UniversityAmesUSA

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