`BookProof.ChapterAngularMomentum.fderiv_rotationVector` (u : ℂ → ℂ) (z : ℂ) : fderiv ℝ u z (Complex.I * z) = z.re * fderiv ℝ u z Complex.I

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`BookProof.ChapterAngularMomentum.fderiv_rotationVector` (u : ℂ → ℂ) (z : ℂ) : fderiv ℝ u z (Complex.I * z) = z.re * fderiv ℝ u z Complex.I - z.im * fderiv ℝ u z 1 · Prove2Me