theorem weighted_trade_conservation (a : Fin 2 → Fin 2 → ℝ) : -- Antisymmetric coupling sums to zero (a 0 1 - a 1 0) + (a 1 0 - a 0 1) = 0 := by ring
thesis/CESProofs/Dynamics/BusinessCycles.lean:473
## Proposition 3b.5: Oscillation Spectrum with Weights