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`BookProof.ChapterFreeFieldBornSignGauge.bornMap_signFlip` {s : Fin n → ℝ} (hs : ∀ k, s k = 1 ∨ s k = -1) (x : EuclideanSpace ℝ (Fin n)) : bornMap (signFlip s x) = bornMap x · Prove2Me