Matthew Sparkes / New Scientist: Levent Alpöge, a mathematician who works at Anthropic, says he was able to disprove the 87-year-old Jacobian conjecture with the help of Fable 5 — Levent Alpöge announced the solution on X A mathematician has cracked an 87-year-old conundrum with the help of AI and announced the solution unceremoniously in a tweet.