`BookProof.ChapterHierarchicalBayesComposition.idKernel_nonnegative` : IsNonnegativeKernel (idKernel : A → A → ℝ)

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`BookProof.ChapterHierarchicalBayesComposition.idKernel_nonnegative` : IsNonnegativeKernel (idKernel : A → A → ℝ) · Prove2Me