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thrawnca comments on 0 And 1 Are Not Probabilities - Less Wrong
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Probabilities of 0 and 1 are perhaps more like the perfectly massless, perfectly inelastic rods we learn about in high school physics - they are useful as part of an idealized model which is often sufficient to accurately predict real-world events, but we know that they are idealizations that will never be seen in real life.
However, I think we can assign the primeness of 7 a value of "so close to 1 that there's no point in worrying about it".
Perhaps the only appropriate uses for probability 0 and 1 are to refer to logical contradictions (eg P & !P) and tautologies (P -> P), rather than real-world probabilities?