Fable 5 is credited with a 3-variable counterexample to the Jacobian conjecture
Various-Affect4841 · reddit · 2026-07-21
A Reddit post summarizes a video about Fable 5 supposedly finding a concise 3-variable polynomial counterexample to Keller’s 1939 Jacobian conjecture.
Key points from the breakdown:
- The map keeps a constant determinant of -2.
- It still sends three separate input coordinates to (-1/4, 0, 0).
- The explanation highlights how non-proper maps can evade local invertibility intuition by pushing preimage boundaries off to infinity.
The post treats the result as a striking math/demo moment rather than a formal paper link.
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