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`BookProof.ChapterStoneMeasurable.WeakMeasurableUnitaryGroup.genOp_bAvg` (x : H) (a : ℝ) : G.genOp ⟨G.bAvg x a, G.bAvg_mem_genDomain x a⟩ = Complex.I • (G.U a x - x) · Prove2Me