`BookProof.ChapterOrthogonalSums.summable_of_orthogonal_of_summable_norm_sq` [CompleteSpace E] {ι : Type*} {v : ι → E} (horth : ∀ x y, x ≠ y → ⟪v x, v y⟫_ℂ = 0) (hsum : Summable fu

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`BookProof.ChapterOrthogonalSums.summable_of_orthogonal_of_summable_norm_sq` [CompleteSpace E] {ι : Type*} {v : ι → E} (horth : ∀ x y, x ≠ y → ⟪v x, v y⟫_ℂ = 0) (hsum : Summable fu · Prove2Me