`BookProof.ChapterStoneSeparable.hasDerivAt_phaseGroup` (f : ℤ → ℝ) (x : (mulSA f).domain) : HasDerivAt (fun t : ℝ => (phaseGroup f).U t (x : L2Z)) ((-Complex.I) • (mulSA f).op x)

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`BookProof.ChapterStoneSeparable.hasDerivAt_phaseGroup` (f : ℤ → ℝ) (x : (mulSA f).domain) : HasDerivAt (fun t : ℝ => (phaseGroup f).U t (x : L2Z)) ((-Complex.I) • (mulSA f).op x) · Prove2Me