theorem cesGeneralHessianQF_euler (ρ F : ℝ)
(P x : Fin J → ℝ)
(hx : ∀ j, x j ≠ 0) (hP : ∑ j, P j = 1) :
cesGeneralHessianQF ρ F P x x = 0 := by
rw [cesGeneralHessianQF_eq_neg_variance ρ F P x x hx]
have h1 : ∀ k : Fin J, x k / x k = 1 :=
fun k => div_self (hx k)
simp_rw [h1, one_pow, mul_one, hP, one_pow,
sub_self, mul_zero]General CES Hessian at Arbitrary Allocation