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`BookProof.ChapterGaugeComprehensiveFixing.exists_not_extendable_of_not_complete` (hS : ¬ IsCompleteGaugeFixing' G S) : ∃ h : X → ℝ, ¬ ∃ f : X → ℝ, IsPhysicalObservable G f ∧ ∀ s ∈ · Prove2Me