Claude Casually Disproves an 87 Year Old Math Problem, U.S. Weighs a Chinese AI Crackdown
Today we're covering the biggest AI stories of July 21st, 2026. Claude Fable 5 produced a one line formula that disproves the Jacobian conjecture, an algebra problem that stumped mathematicians since 1939, with Anthropic researcher Levent Alpöge posting the takedown on X over the World Cup final weekend and thanking his "close friend Fable for working during the game," a problem one famed mathematician predicted in 2008 could take humans another 100 years to crack. A new Axios report claims Washington is exploring restrictions on Chinese AI models following Moonshot's near frontier Kimi K3…
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