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`BookProof.ChapterFiniteArithmeticPrior.prior_is_probability` {B : ℕ} {H : Type*} [Fintype H] (E : BayesianArithmeticExtension B H) : (∀ h, 0 ≤ E.prior h) ∧ ∑ h, E.prior h = 1 · Prove2Me