`BookProof.ChapterMackeyImprimitivity.sum_norm_sq_of_orthogonal` {f : X → E} {ψ : E} (hsum : ∑ x, f x = ψ) (horth : ∀ x y, x ≠ y → ⟪f x, f y⟫_ℂ = 0) : ∑ x : X, ‖f x‖ ^ 2...

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`BookProof.ChapterMackeyImprimitivity.sum_norm_sq_of_orthogonal` {f : X → E} {ψ : E} (hsum : ∑ x, f x = ψ) (horth : ∀ x y, x ≠ y → ⟪f x, f y⟫_ℂ = 0) : ∑ x : X, ‖f x‖ ^ 2... · Prove2Me