`BookProof.ChapterA3.exists_real_of_conj_fixed` {N : Matrix (Fin 4) (Fin 4) ℂ} (hN : N.map (starRingEnd ℂ) = N) : ∃ M : Matrix (Fin 4) (Fin 4) ℝ, toC M = N

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`BookProof.ChapterA3.exists_real_of_conj_fixed` {N : Matrix (Fin 4) (Fin 4) ℂ} (hN : N.map (starRingEnd ℂ) = N) : ∃ M : Matrix (Fin 4) (Fin 4) ℝ, toC M = N · Prove2Me