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`BookProof.ChapterShannonSampling.bandSignal_eq_inner` (F : Lp ℂ 2 (haarAddCircle (T := T))) (x : ℝ) : bandSignal (T := T) (F : AddCircle T → ℂ) x = (T : ℂ) * inner ℂ (kernLp (T := · Prove2Me