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`BookProof.ChapterWignerLittleGroupOrbits.future_cone_invariant` {A : Matrix (Fin 2) (Fin 2) ℂ} (hA : A.det = 1) {p q : Fin 4 → ℝ} (hp0 : 0 < p 0) (hmass : 0 ≤ p 0 ^ 2 - p 1 ^ 2 - · Prove2Me