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`BookProof.ChapterOrthogonalSums.hasSum_norm_sq_of_hasSum` {ι : Type*} {v : ι → E} {psi : E} (h : HasSum v psi) (horth : ∀ x y, x ≠ y → ⟪v x, v y⟫_ℂ = 0) : HasSum (fun x => ‖v x‖ ^ · Prove2Me