theorem logistic_fragility_positive {u : ℝ} (hu_lt : u < 1 / 2) (_hu_lt1 : u < 1) : 0 < logisticElasticity u := by simp only [logisticElasticity] apply div_pos · linarith · linarith
thesis/CESProofs/Hierarchy/WelfareDecomposition.lean:197
Theorems 7-8, Propositions 5 and 7, Corollary 3: