`BookProof.ChapterA3.lambda_surjective` (hpf : PauliFundamental) (Λ : Matrix (Fin 4) (Fin 4) ℝ) (hΛ : Λ ∈ LorentzO) : ∃ S : Matrix (Fin 4) (Fin 4) ℝ, IsPin S ∧ LambdaOf S = Λ

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`BookProof.ChapterA3.lambda_surjective` (hpf : PauliFundamental) (Λ : Matrix (Fin 4) (Fin 4) ℝ) (hΛ : Λ ∈ LorentzO) : ∃ S : Matrix (Fin 4) (Fin 4) ℝ, IsPin S ∧ LambdaOf S = Λ · Prove2Me