Viral claim: Claude Fable 5 may have cracked the Jacobian conjecture
kimmonismus · x · 2026-07-20
A viral thread claims Claude Fable 5 produced a hand-checkable counterexample to the long-open Jacobian conjecture.
- The conjecture, open since 1939, says that a polynomial map with a constant non-zero Jacobian determinant must have a polynomial inverse.
- The post frames this as an almost absurdly large breakthrough: an 87-year-old problem allegedly solved by a model on a Sunday evening.
- The attached image shows multiple researchers reacting with disbelief and excitement, underscoring how shocking the claim is to the math/AI crowd.
The key point is not a verified proof, but the reaction: if true, it would be one of the most extraordinary AI-math moments yet.
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