`BookProof.ChapterPriorDependence.diracPrior_sum_one` (a : Hyp) : ∑ x, diracPrior a x = 1

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`BookProof.ChapterPriorDependence.diracPrior_sum_one` (a : Hyp) : ∑ x, diracPrior a x = 1 · Prove2Me