Coupling Geometry Case Study XXX: The French Revolution, 1789–1799

This case study puts Coupling Geometry itself on trial. Can a framework accused of unfalsifiability prove otherwise? In April 2026, nineteen predictions were derived from the frozen theory — using refinements built entirely from Byzantium, Tokugawa, and the quantitative studies — before consulting the evidence on a case none of them had touched: the French Revolution. All nineteen were confirmed. This study reports the result with the calibration it demands: the Revolution’s outline is general knowledge, so the test is out-of-sample for the refinements, not blind to history, and its weight rests on the four predictions no encyclopaedia supplies. That a population whose identity the reconstruction crossed would choose destruction — the Vendée: roughly 800,000 people, up to 200,000 dead, predicted from a Byzantine refusal four centuries and half a continent away. That elite factions would block every reform to the end — the Assembly of Notables, closing the monarchy’s last fiscal exit. That the rupture would take three exits in order — constitutional restructuring, the Terror, Napoleon. And that the Napoleonic wars were a frontier reopening whose failure returned the pressure the revolution promised to abolish. Around the test: the French coupling trajectory 5.0 → 5.6 → 6.3 across five centuries — the ratchet in three published numbers. Case Study XXIX: South Africa, 1948–Present