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`BookProof.ChapterSolidHarmonic.sum_nullCLM_sq` {u v : E} (hu : ‖u‖ = 1) (hv : ‖v‖ = 1) (huv : ⟪u, v⟫_ℝ = 0) : ∑ i, (nullCLM u v (stdOrthonormalBasis ℝ E i)) ^ 2 = 0 · Prove2Me