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1 results

  • STANDARD BAYES LOGIC IS NOT FINITELY AXIOMATIZABLE

  • ZALÁN GYENIS
  • Journal:
    The Review of Symbolic Logic / Volume 13 / Issue 2 / June 2020
    Published online by Cambridge University Press:
    22 March 2019, pp. 326-337
    Print publication:
    June 2020

  • In the article [2] a hierarchy of modal logics has been defined to capture the logical features of Bayesian belief revision. Elements in that hierarchy were distinguished by the cardinality of the set of elementary propositions. By linking the modal logics in the hierarchy to the modal logics of Medvedev frames it has been shown that the modal logic of Bayesian belief revision determined by probabilities on a finite set of elementary propositions is not finitely axiomatizable. However, the infinite case remained open. In this article we prove that the modal logic of Bayesian belief revision determined by standard Borel spaces (these cover probability spaces that occur in most of the applications) is also not finitely axiomatizable.