`BookProof.ChapterConditional.trace_gram_eq_one` (B : Matrix Y X 𝕜) (hB : ∑ x, ∑ y, ‖B y x‖ ^ 2 = 1) : (Bᴴ * B).trace = ((1 : ℝ) : 𝕜)

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`BookProof.ChapterConditional.trace_gram_eq_one` (B : Matrix Y X 𝕜) (hB : ∑ x, ∑ y, ‖B y x‖ ^ 2 = 1) : (Bᴴ * B).trace = ((1 : ℝ) : 𝕜) · Prove2Me