theorem curvature_is_aversion_times_diversity (J : ℕ) (ρ : ℝ) : curvatureK J ρ = inequalityAversion ρ * ((↑J - 1) / ↑J) := by simp only [curvatureK, inequalityAversion]; ring
thesis/CESProofs/Applications/SocialWelfare.lean:68
CES as Atkinson Social Welfare Function