`BookProof.ChapterG.swap_mem_gaugeGroup` {X Y : Type*} [DecidableEq X] {π : X → Y} {x x' : X} (h : π x = π x') : Equiv.swap x x' ∈ gaugeGroup π

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`BookProof.ChapterG.swap_mem_gaugeGroup` {X Y : Type*} [DecidableEq X] {π : X → Y} {x x' : X} (h : π x = π x') : Equiv.swap x x' ∈ gaugeGroup π · Prove2Me