`BookProof.ChapterA3.hasLambda_neg` {S Λ : Matrix (Fin 4) (Fin 4) ℝ} (h : HasLambda S Λ) : HasLambda (-S) Λ

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`BookProof.ChapterA3.hasLambda_neg` {S Λ : Matrix (Fin 4) (Fin 4) ℝ} (h : HasLambda S Λ) : HasLambda (-S) Λ · Prove2Me