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David Atkinson, Jeanne Peijnenburg
preprint description
Reichenbach's use of `posits' to defend his frequentistic theory of probability has been criticized on the grounds that it makes unfalsifiable predictions. The justice of this criticism has blinded many to Reichenbach's second use of a posit, one that can fruitfully be applied to current debates within epistemology. We show first that Reichenbach's alternative type of posit creates a difficulty for epistemic foundationalists, and then that its use is equivalent to a particular kind of Jeffrey conditionalization. We conclude that, under particular circumstances, Reichenbach's approach and that of the Bayesians amount to the same thing, thereby presenting us with a new instance in which chance and credence coincide.

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