private theorem cesEigenvaluePerp_abs_pos {J : ℕ} (hJ : 0 < J) {ρ : ℝ} (hρ : ρ < 1)
{c : ℝ} (hc : 0 < c) :
0 < |cesEigenvaluePerp J ρ c| :=
abs_pos.mpr (ne_of_lt (cesEigenvaluePerp_neg hJ hρ hc))Discrete-Time Stability of CES Tâtonnement (Edge of Stability)