`BookProof.ChapterSolidHarmonicTools.fderiv_fderiv_clmPow` (ψ : E →L[ℝ] ℂ) (k : ℕ) (x v w : E) : fderiv ℝ (fderiv ℝ fun y => (ψ y) ^ k) x v w = (k : ℂ) * ((k : ℂ)

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`BookProof.ChapterSolidHarmonicTools.fderiv_fderiv_clmPow` (ψ : E →L[ℝ] ℂ) (k : ℕ) (x v w : E) : fderiv ℝ (fderiv ℝ fun y => (ψ y) ^ k) x v w = (k : ℂ) * ((k : ℂ) - 1) * (ψ x) ^ (k · Prove2Me