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`BookProof.ChapterA3.hasAdLambda_add` {G₁ G₂ A₁ A₂ : Matrix (Fin 4) (Fin 4) ℝ} (h1 : HasAdLambda G₁ A₁) (h2 : HasAdLambda G₂ A₂) : HasAdLambda (G₁ + G₂) (A₁ + A₂) · Prove2Me