`BookProof.ChapterOrthogonalSums.norm_sum_sq_of_orthogonal` {ι : Type*} (t : Finset ι) {v : ι → E} (horth : ∀ x y, x ≠ y → ⟪v x, v y⟫_ℂ = 0) : ‖∑ x ∈ t, v x‖ ^ 2 = ∑...

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`BookProof.ChapterOrthogonalSums.norm_sum_sq_of_orthogonal` {ι : Type*} (t : Finset ι) {v : ι → E} (horth : ∀ x y, x ≠ y → ⟪v x, v y⟫_ℂ = 0) : ‖∑ x ∈ t, v x‖ ^ 2 = ∑... · Prove2Me