# Mathematician produces counterexample to Jacobian Conjecture

Claude Fable has reportedly produced a counterexample to the Jacobian Conjecture, a decades-old unsolved problem in algebraic geometry. If verified, this would disprove the conjecture, potentially reshaping key areas of mathematics. The result, shared on Hacker News, has sparked intense discussion and scrutiny among mathematicians.

**Importance:** 5/5

## Sources

### Technology
- [Hacker News](https://xcancel.com/__alpoge__/status/2079028340955197566) — Mon, 20 Jul 2026 02:51:16 +0000
- [Hacker News](https://terrytao.wordpress.com/2026/07/21/a-digestion-of-the-jacobian-conjecture-counterexample/) — Tue, 21 Jul 2026 21:09:25 +0000
- [Hacker News](https://chatgpt.com/share/6a5fdc7a-d6f8-83e8-bbea-8deb42cfed56) — Wed, 22 Jul 2026 17:30:40 +0000