`BookProof.ChapterSolidHarmonicTools.laplacian_angular_mul` {A B : E → ℝ} {x : E} {α β : ℝ} {e : E} {μ : ℕ} (hA : ContDiffAt ℝ 2 A x) (hB : ContDiffAt ℝ 2 B x) (hharm : (Δ A) x = 0

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`BookProof.ChapterSolidHarmonicTools.laplacian_angular_mul` {A B : E → ℝ} {x : E} {α β : ℝ} {e : E} {μ : ℕ} (hA : ContDiffAt ℝ 2 A x) (hB : ContDiffAt ℝ 2 B x) (hharm : (Δ A) x = 0 · Prove2Me