theorem escortFisherQF_nonneg (ρ : ℝ) (P x v : Fin J → ℝ)
(hP_nn : ∀ j, 0 ≤ P j) (hP_sum : ∑ j, P j = 1) :
0 ≤ escortFisherQF ρ P x v := by
simp only [escortFisherQF]
apply mul_nonneg (sq_nonneg ρ)
exact weighted_variance_nonneg P (fun j => v j / x j) hP_nn hP_sumGeneral CES Hessian at Arbitrary Allocation