`BookProof.ChapterA.rImagCx_sq` {M : System ℝ W} {J : W ≃ₗᵢ[ℝ] W} (hJ : IsRImaginary M J) (x : Cx W) : rImagCx J (rImagCx J x) = -x

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`BookProof.ChapterA.rImagCx_sq` {M : System ℝ W} {J : W ≃ₗᵢ[ℝ] W} (hJ : IsRImaginary M J) (x : Cx W) : rImagCx J (rImagCx J x) = -x · Prove2Me