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`BookProof.ChapterPauliSU2.su2_preserves_time` {T : Matrix (Fin 2) (Fin 2) ℂ} (hT : Tᴴ * T = 1) (x : Fin 4 → ℝ) : (vecOfMat (spinorAction T (hermMat x))) 0 = x 0 · Prove2Me