`BookProof.ChapterSolidHarmonic.contDiff_angular` (u v : E) (μ : ℕ) : ContDiff ℝ 2 (angular u v μ)

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`BookProof.ChapterSolidHarmonic.contDiff_angular` (u v : E) (μ : ℕ) : ContDiff ℝ 2 (angular u v μ) · Prove2Me