Totality, Regularity, and Cardinality in Probability Theory

Philosophy of Science 91 (3):721-740 (2024)
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Abstract

Recent developments in generalized probability theory have renewed a debate about whether regularity (i.e., the constraint that only logical contradictions get assigned probability 0) should be a necessary feature of both chances and credences. Crucial to this debate, however, are some mathematical facts regarding the interplay between the existence of regular generalized probability measures and various cardinality assumptions. We improve on several known results in the literature regarding the existence of regular generalized probability measures. In particular, we give necessary and sufficient conditions for the existence of regular generalized probability measures defined on the whole powerset of any sample space.

Author Profiles

Guillaume Massas
Scuola Normale Superiore
Paolo Mancosu
University of California, Berkeley

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