BIT Numerical Mathematics

, Volume 32, Issue 1, pp 10–14 | Cite as

The paradox of trees in type theory

  • Thierry Coquand
Programming Logic

Abstract

We show how to represent a paradox similar to Russell's paradox in Type Theory withW-types and a type of all types, and how to use this in order to represent a fixed-point operator in such a theory. It is still open whether such a construction is possible without theW-type.

C.R. Categories

D.2.1 D.2.4 D.3.1 F.3.1 F.3.3 

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References

  1. 1.
    Martin-Löf, P.,Intuitionistic Type Theory, Bibliopolis, 1984.Google Scholar
  2. 2.
    Palmgren, E.,A construction of Type: Type in Martin-Löf's partial type theory with one universe, Unpublished manuscript.Google Scholar
  3. 3.
    Palmgren, E. and Stoltenberg-Hansen, V.,Domain Interpretations of Intuitionistic Type Theory, Uppsala University. U.U.D. Report 1989: 1.Google Scholar
  4. 4.
    Aczel, P.,The type theoretic interpretation of constructive set theory, Logic Colloquium '77 (1978), 55–66, A. Macintyre et al., editors.Google Scholar
  5. 5.
    Meyer, A. and Reinhold, M. B.,“Type” is not a type, Principles of Programming language, ACM, 1986.Google Scholar
  6. 6.
    Howe, D.,The Computational Behaviour of Girard's Paradox, Symposium on Logic in Computer Science, Ithaca, New York, 1987.Google Scholar
  7. 7.
    Hayashi, S. and Nakano, H.,Communication in the TYPES electronic forum (August 7, 1987), types theory. lcs. mit. edu.Google Scholar
  8. 8.
    Girard, J. Y.,Interprétation fonctionnelle et élimination des coupures dans l'arithmétique d'ordre supérieure, Thèse d'Etat, Paris VII, 1972.Google Scholar

Copyright information

© BIT Foundations 1992

Authors and Affiliations

  • Thierry Coquand
    • 1
    • 2
  1. 1.INRIADomaine de Voluceau-RocquencourtLe Chesnay-CedexFrance
  2. 2.University of Göteborg/ChalmersGöteborgSweden

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