`BookProof.ChapterConditional.pCond_sum_one` (B : Matrix Y X 𝕜) (x : X) (hx : 0 < pMarg B x) : ∑ y, pCond B x y = 1

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`BookProof.ChapterConditional.pCond_sum_one` (B : Matrix Y X 𝕜) (x : X) (hx : 0 < pMarg B x) : ∑ y, pCond B x y = 1 · Prove2Me