`BookProof.ChapterGaugeParametrization.isComprehensiveGaugeFixing_iff_surjOn` (π : X → Y) (S : Set X) : IsComprehensiveGaugeFixing (fiberGauge π) S ↔ ∀ x : X, ∃ s ∈ S, π s = π x

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`BookProof.ChapterGaugeParametrization.isComprehensiveGaugeFixing_iff_surjOn` (π : X → Y) (S : Set X) : IsComprehensiveGaugeFixing (fiberGauge π) S ↔ ∀ x : X, ∃ s ∈ S, π s = π x · Prove2Me