Anthropic’s Fable 5 found a 216-character counterexample to the Jacobian conjecture, an 87-year-old maths problem. Experts are split on what it means.

Mathematicians have been trying to prove the Jacobian conjecture for nearly a century, but now the Claude Fable 5 AI has apparently found a counterexample that disproves it

The Jacobian conjecture has bedeviled math experts for nearly 90 years.