army1987 comments on Rationally Irrational - Less Wrong
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I find it interesting, even telling, that nobody has yet challenged the assumptions behind the proposition "Rationality is a tool for accuracy," which would be that "rationality is the best tool for accuracy" and/or that "rationality is the sole tool that can be used to achieve accuracy."
Cox's theorem does show that Bayesian probability theory (around here a.k.a. epistemic rationality) is the only way to assign numbers to beliefs which satisfies certain desiderata.