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Full Idea
Those who see probabilities as ratios of frequencies can't use Bayes's Theorem if there is no objective prior probability. Those who accept prior probabilities tend to opt for a subjectivist account, where probabilities are degrees of belief.
Gist of Idea
Probability supports Bayesianism better as degrees of belief than as ratios of frequencies
Source
Mark Colyvan (Introduction to the Philosophy of Mathematics [2012], 9.1.8)
Book Ref
Colyvan,Mark: 'An Introduction to the Philosophy of Mathematics' [CUP 2012], p.156
A Reaction
[compressed]