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