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`BookProof.ChapterPauliSU2.su2_preserves_spatialNormSq` {T : Matrix (Fin 2) (Fin 2) ℂ} (hU : Tᴴ * T = 1) (hT : T.det = 1) (x : Fin 4 → ℝ) : spatialNormSq (vecOfMat (spinorAction T · Prove2Me