`BookProof.ChapterSolidHarmonic.angular_axis` {u v e : E} (hue : ⟪u, e⟫_ℝ = 0) (hve : ⟪v, e⟫_ℝ = 0) (μ : ℕ) (x : E) : fderiv ℝ (angular u v μ) x e = 0

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`BookProof.ChapterSolidHarmonic.angular_axis` {u v e : E} (hue : ⟪u, e⟫_ℝ = 0) (hve : ⟪v, e⟫_ℝ = 0) (μ : ℕ) (x : E) : fderiv ℝ (angular u v μ) x e = 0 · Prove2Me