AnalysisScienceJuly 20, 2026

Claude Fable 5 produced counterexample to 87-year-old Jacobian conjecture

Claude Fable 5 produced a hand-checkable counterexample to the Jacobian conjecture, an open problem since 1939. Smale listed it as Problem #16 on his 18-problem list for the 21st century, alongside P vs NP, though the result awaits full review.

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