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Triviality Results for Probabilistic Modals
Author(s) -
Goldstein Simon
Publication year - 2019
Publication title -
philosophy and phenomenological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 39
eISSN - 1933-1592
pISSN - 0031-8205
DOI - 10.1111/phpr.12477
Subject(s) - credence , modal verb , probabilistic logic , triviality , axiom , mathematics , semantics (computer science) , possible world , certainty , variety (cybernetics) , linguistics , computer science , artificial intelligence , epistemology , philosophy , pure mathematics , verb , statistics , geometry , programming language
In recent years, a number of theorists have claimed that beliefs about probability are transparent. To believe probably p is simply to have a high credence that p. In this paper, I prove a variety of triviality results for theses like the above. I show that such claims are inconsistent with the thesis that probabilistic modal sentences have propositions or sets of worlds as their meaning. Then I consider the extent to which a dynamic semantics for probabilistic modals can capture theses connecting belief, certainty, credence, and probability. I show that although a dynamic semantics for probabilistic modals does allow one to validate such theses, it can only do so at a cost. I prove that such theses can only be valid if probabilistic modals do not satisfy the axioms of the probability calculus.