`BookProof.ChapterLorentzTranslation.properTime_rest` (x0 : ℝ) (xs : Fin 3 → ℝ) : properTime (fun _ => 0) x0 xs = x0

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`BookProof.ChapterLorentzTranslation.properTime_rest` (x0 : ℝ) (xs : Fin 3 → ℝ) : properTime (fun _ => 0) x0 xs = x0 · Prove2Me