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`BookProof.ChapterPauliLorentz.hermMat_injective` {x y : Fin 4 → ℝ} (h : hermMat x = hermMat y) : x 0 = y 0 ∧ x 1 = y 1 ∧ x 2 = y 2 ∧ x 3 = y 3 · Prove2Me