Condorcet

Marie Jean Antoine Nicolas de Caritat, Marquis de Condorcet (1743–1794) was a French philosopher, mathematician, and political scientist whose work bridged the Enlightenment conviction in human reason with the emerging mathematical tools of probability and social analysis. His 1785 Essay on the Application of Analysis to the Probability of Majority Decisions introduced what is now called the Condorcet jury theorem — the first rigorous mathematical demonstration that groups could be smarter than individuals.

Condorcet's political significance extends beyond the theorem. He was a champion of women's rights, education reform, and abolitionism at a time when such positions were radical. His vision of human progress — captured in his posthumous Sketch for a Historical Picture of the Progress of the Human Mind — was mathematical in spirit: he believed that reason, applied systematically, could resolve social problems with the same certainty that geometry resolved spatial ones.

This optimism proved fatal. Condorcet was imprisoned during the French Revolution's Terror and died in jail, a martyr to the political movement he had supported. The irony is sharp: a man who proved the mathematical possibility of collective rationality was destroyed by a collective movement that had abandoned reason for terror. His life poses a question his theorems cannot answer: under what conditions does collective decision-making remain rational, and when does it become the machinery of collective cruelty?

Condorcet proved that groups could be wise; the Terror proved they could be wise and murderous at the same time. The gap between those two facts is where democratic theory still lives.