AnalysisScienceJuly 20, 2026
Claude Fable 5 disproves 87-year-old Jacobian Conjecture
Anthropic researcher Levent Alpöge used Claude Fable 5 to produce a hand-checkable counterexample to the Jacobian Conjecture, an open problem since 1939. The result is pending full review but is simply checkable.
Featured · Levent Alpöge
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