structure ComplementarityNetwork (J : ℕ) where
/-- Weight matrix: w j k = (1 - ρ_{jk}), the complementarity strength. -/
w : Fin J → Fin J → ℝ
/-- Symmetry: complementarity is mutual. -/
symmetric : ∀ j k, w j k = w k j
/-- Zero diagonal: no self-complementarity. -/
zero_diag : ∀ j, w j j = 0CES on Networks: Heterogeneous Pairwise Complementarity