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A comment on Claude Fable produced a counterexample to the Jacobian Conjecture. Parent comment

Re:Claude Fable produced a counterexample to the Jacobian Co... by sciyoshi on Monday July 20, 2026 @12:48AM (#48974470)
Looks like this has already been formalized: https://github.com/deancureton/jacobian
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Re:Claude Fable produced a counterexample to the Jacobian Co... by bugufu8f83 on Monday July 20, 2026 @01:03AM (#48974533)
To be clear, this is not the kind of thing where a Lean formalization provides any value at all. It's like formalizing the answer to a high school algebra problem. The counterexample is obviously correct.
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Re:Claude Fable produced a counterexample to the Jacobian Co... by sciyoshi on Monday July 20, 2026 @01:44AM (#48974760)
Indeed. I was mainly responding to the comment about waiting for "independent seasoned mathematicians to verify", whereas in this case it is easy enough to convince oneself of the counterexample's correctness.
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