About the undecidability of program equivalence in finitary languages with state

  • Authors:
  • Andrzej S. Murawski

  • Affiliations:
  • Oxford University Computing Laboratory

  • Venue:
  • ACM Transactions on Computational Logic (TOCL)
  • Year:
  • 2005

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Abstract

We show how game semantics can be employed to prove that program equivalence in finitary Idealized Algol with active expressions is undecidable. We also investigate a notion of representability of languages by terms and show that finitary Idealized Algol terms of respectively second, third and higher orders define exactly regular, context-free and recursively enumerable languages.