`BookProof.ChapterNumericalRangeSemigroup.hasDerivAt_normSq` (A : E →L[ℂ] E) (x : E) (t : ℝ) : HasDerivAt (fun s : ℝ => ‖(NormedSpace.exp (s • A)) x‖ ^ 2) (2 * (inner ℂ (NormedSpac

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`BookProof.ChapterNumericalRangeSemigroup.hasDerivAt_normSq` (A : E →L[ℂ] E) (x : E) (t : ℝ) : HasDerivAt (fun s : ℝ => ‖(NormedSpace.exp (s • A)) x‖ ^ 2) (2 * (inner ℂ (NormedSpac · Prove2Me