# Probability for the Revision Theory of Truth

Catrin Campbell-Moore, Leon Horsten, Hannes Leitgeb

2018

### Abstract

We investigate how to assign probabilities to sentences that contain a type-free truth predicate. These probability values track how often a sentence is satisfied in transfinite revision sequences, following Gupta and Belnap’s revision theory of truth. This answers an open problem by Leitgeb which asks how one might describe transfinite stages of the revision sequence using such probability functions. We offer a general construction, and explore additional constraints that lead to desirable properties of the resulting probability function. One such property is Leitgeb’s Probabilistic Convention T, which says that the probability of φ equals the probability that φ is true.

Publication

Journal of Philosophical Logic

This was published as part of a special issue on for the 25th anniversary of the publication of Revision Theory of Truth by Anil Gupta and Nuel Belnap.