`BookProof.ChapterA3.isPin_of_sq_neg_one` {S : Matrix (Fin 4) (Fin 4) ℝ} (h : S * S = -1) (hL : ∃ Λ, HasLambda S Λ) : IsPin S

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`BookProof.ChapterA3.isPin_of_sq_neg_one` {S : Matrix (Fin 4) (Fin 4) ℝ} (h : S * S = -1) (hL : ∃ Λ, HasLambda S Λ) : IsPin S · Prove2Me