2026-09-09
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This is the World in Brief from The Economist.
Top stories.
OpenAI said it used an unreleased artificial intelligence model to crack one of mathematics' trickiest problems.
The Navier-Stokes equations explain how fluids behave.
They are one of seven unsolved Millennium Prize problems selected by the Clay Mathematics Institute in Massachusetts.
But the findings were overshadowed by a spat with a New York University mathematician