`BookProof.ChapterFreeFieldBornSignAction.boolFlip_free_of_pos` {b : Fin n → Bool} {x : EuclideanSpace ℝ (Fin n)} (hx : ∀ k, x k ≠ 0) : boolFlip b x = x ↔ b = (fun _ => false)

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`BookProof.ChapterFreeFieldBornSignAction.boolFlip_free_of_pos` {b : Fin n → Bool} {x : EuclideanSpace ℝ (Fin n)} (hx : ∀ k, x k ≠ 0) : boolFlip b x = x ↔ b = (fun _ => false) · Prove2Me