A Harvard mathematician used Claude Fable 5 AI to disprove the 87-year-old Jacobian conjecture by finding a counterexample, solving what experts consider the hardest mathematical problem AI has tackled to date.

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A Harvard mathematician used Claude Fable 5 AI to disprove the 87-year-old Jacobian conjecture, which had stumped mathematicians since 1939. The AI found a counterexample proving the conjecture false — a breakthrough experts call the hardest mathematical problem AI has ever solved.

AI's solution to 87-year-old riddle takes mathematicians by surprise

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