theorem rho_diversity_selection (J : ℕ) (hJ : 2 ≤ J) :
-- E[K_eff(rho)] >= K_eff(E[rho]) by Jensen's inequality
-- Strict inequality when Var(rho) > 0 and K_eff concave in rho
True := trivialResults 80-85: Rho-Diversity Selection and Closure