Claude Fable 5 AI finds a tiny formula that topples an 87-year-old math conjecture

Science Daily | Wed, 05 Aug 2026 22:02:49 EDT

AI at Anthropic,
Discovers a simple flaw—
Jacobian falls.

A mathematician working at Anthropic says he used the AI model Claude Fable 5 to uncover a remarkably simple counterexample to the Jacobian conjecture, a famous problem that has resisted mathematicians for more than a century. The result shows that the conjecture is false in…

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