AI model Claude Fable produces counterexample to the Jacobian Conjecture

Anthropic's AI model Claude Fable has produced a counterexample to the Jacobian Conjecture, a long-standing unsolved problem in mathematics. The finding, flagged by mathematicians on X (formerly Twitter), has sparked discussion in the academic community. If the counterexample proves valid, it would disprove a conjecture that has remained open for decades.