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

Initializing...

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