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Online Papers - Brian Weatherson

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From Classical to Intuitionistic Probability 497<br />

¬A = df A ⊃ ⊥<br />

Assuming A ∧ B is consistent, it follows from (C4) and (C⊥) that Pr(¬A, B) = 0.<br />

Again, from our perspective this is an implausible result. The main purpose of this<br />

appendix has been to show that the Morgan–Leblanc–Mares probability calculus cannot<br />

do the work Bayesians want a probability calculus to do. That is, it is implausible<br />

to regard their Pr(A, B) as the reasonable degree of belief in A given B. Hence the account<br />

of conditional probability these authors offer diverges from the intuitionistic<br />

Bayesianism that we have been urging heterodox theorists to endorse.

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