Claude Fable 5 has produced a hand-checkable counterexample to the Jacobian conjecture， an open problem dating to 1939.
The conjecture says that a polynomial map with a constant non-zero Jacobian determinant must have a polynomial inverse.
An 87-year-old problem was casually solved by Fable 5 on a sunday evening. Insane times to live in.
hello there the jacobian conjecture is false thanx to my close friend akhil for asking about it and my other close friend fable for working during the world cup...