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`BookProof.ChapterA3.upsilonC_Qc` (T : Matrix (Fin 2) (Fin 2) ℂ) (hT : T.det = 1) (x : Fin 4 → ℂ) : Qc (fun μ => ∑ ν, UpsilonC T μ ν * x ν) = Qc x · Prove2Me