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`BookProof.ChapterSequentialBayes.bayesUpdate_nonneg` {prior ℓ : X → ℝ} (hprior : ∀ x, 0 ≤ prior x) (hℓ : ∀ x, 0 ≤ ℓ x) (x : X) : 0 ≤ bayesUpdate prior ℓ x · Prove2Me