`BookProof.LorentzGroup.isLorentz_inv` {l : Matrix (Fin 4) (Fin 4) ℝ} (h : IsLorentz l) : IsLorentz l⁻¹

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`BookProof.LorentzGroup.isLorentz_inv` {l : Matrix (Fin 4) (Fin 4) ℝ} (h : IsLorentz l) : IsLorentz l⁻¹ · Prove2Me