An application of Π21-logic to descriptive set theory

  • E. R. Griffor
Conference paper
Part of the Lecture Notes in Mathematics book series (LNM, volume 1141)


Natural Transformation Direct Limit Completeness Theorem Integer Sequence Universal Object 
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  5. Martin, D.A. and R. Solovay [1969] A basis theorem for Σ31-sets of reals, Annals of Math., 89, pp 138–160.MathSciNetCrossRefzbMATHGoogle Scholar
  6. Welch, P. [1984] On Σ31, private communication.Google Scholar

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • E. R. Griffor
    • 1
  1. 1.University of UppsalaUppsalaSweden

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