`BookProof.ChapterA.rimaginary_symm_apply` (J : W ≃ₗᵢ[ℝ] W) (hJ : ∀ x, J (J x) = -x) (x : W) : J.symm x = -J x

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`BookProof.ChapterA.rimaginary_symm_apply` (J : W ≃ₗᵢ[ℝ] W) (hJ : ∀ x, J (J x) = -x) (x : W) : J.symm x = -J x · Prove2Me