`BookProof.ChapterA3.upsilon_mem_lorentz` (T : Matrix (Fin 2) (Fin 2) ℂ) (hT : T.det = 1) : Upsilon T ∈ LorentzO

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`BookProof.ChapterA3.upsilon_mem_lorentz` (T : Matrix (Fin 2) (Fin 2) ℂ) (hT : T.det = 1) : Upsilon T ∈ LorentzO · Prove2Me