`BookProof.ChapterA3.lambdaOf_neg` {S : Matrix (Fin 4) (Fin 4) ℝ} (h : IsPin S) : LambdaOf (-S) = LambdaOf S

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`BookProof.ChapterA3.lambdaOf_neg` {S : Matrix (Fin 4) (Fin 4) ℝ} (h : IsPin S) : LambdaOf (-S) = LambdaOf S · Prove2Me