Journal of Philosophical Logic

, Volume 42, Issue 5, pp 679–695

Gödelizing the Yablo Sequence


  • Cezary Cieśliński
    • Institute of PhilosophyUniversity of Warsaw
    • Institute of Philosophy, Sociology and JournalismGdansk University
    • Centre for Logic and Philosophy of ScienceGhent University

DOI: 10.1007/s10992-012-9244-4


We investigate what happens when ‘truth’ is replaced with ‘provability’ in Yablo’s paradox. By diagonalization, appropriate sequences of sentences can be constructed. Such sequences contain no sentence decided by the background consistent and sufficiently strong arithmetical theory. If the provability predicate satisfies the derivability conditions, each such sentence is provably equivalent to the consistency statement and to the Gödel sentence. Thus each two such sentences are provably equivalent to each other. The same holds for the arithmetization of the existential Yablo paradox. We also look at a formulation which employs Rosser’s provability predicate.


Incompleteness Omega-liar Yablo’s paradox Paradox Provability Arithmetic Goedel

Copyright information

© The Author(s) 2012