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Identifiability of the normalized quadratic slope

theorem ProbabilityTheory.Copula.RankRegion.XiBlest.Support.quadraticBand_injective (b d : ℝ) (hb : 0 ≤ b) (hd : 0 ≤ d) (he : quadraticBand b hb = quadraticBand d hd) : b = d