theorem weight_positive {N : ℕ} (e : WeightedHierarchicalCESEconomy N) (n : Fin N) (j : Fin (e.J n)) : 0 < e.a n j := by exact e.ha_pos n j
thesis/CESProofs/Hierarchy/KnockoutHierarchy.lean:50
## Proposition 4b.4: Critical Supplier Identification