`BookProof.ChapterConditional.pMarg_sum_one` (B : Matrix Y X 𝕜) (hB : ∑ x, ∑ y, ‖B y x‖ ^ 2 = 1) : ∑ x, pMarg B x = 1

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`BookProof.ChapterConditional.pMarg_sum_one` (B : Matrix Y X 𝕜) (hB : ∑ x, ∑ y, ‖B y x‖ ^ 2 = 1) : ∑ x, pMarg B x = 1 · Prove2Me