`BookProof.ChapterGaugeCasimirAverage.gaugeAverage_isPhysicalObservable` (μ : Measure G) [μ.IsMulRightInvariant] (f : X → ℝ) : IsPhysicalObservable G (gaugeAverage (X := X) μ f)

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`BookProof.ChapterGaugeCasimirAverage.gaugeAverage_isPhysicalObservable` (μ : Measure G) [μ.IsMulRightInvariant] (f : X → ℝ) : IsPhysicalObservable G (gaugeAverage (X := X) μ f) · Prove2Me