`BookProof.ChapterFreeFieldBornSignFiber.signFlip_one` (x : EuclideanSpace ℝ (Fin n)) : signFlip (fun _ => 1) x = x

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`BookProof.ChapterFreeFieldBornSignFiber.signFlip_one` (x : EuclideanSpace ℝ (Fin n)) : signFlip (fun _ => 1) x = x · Prove2Me