The post presents a polynomial map from C³ to C³ with constant Jacobian determinant -2 that maps three distinct points to the same point, contradicting the Jacobian Conjecture.
The map is credited to Levent Alpoge, and the post provides an independent symbolic verification using SymPy, with exact rational arithmetic and no floating-point numbers.
Attached files (PDF and Python script) allow readers to reproduce the verification, which includes computing the Jacobian determinant, evaluating the map at three points, and solving for the fiber.
The verification confirms F(0,0,-1/4) = F(1,-3/2,13/2) = F(-1,3/2,13/2) = (-1/4,0,0), with all three inputs distinct and no other solutions.
The post emphasizes that this extraordinary claim requires independent reproduction and expert scrutiny, and provides clear instructions to run the script and verify the checksum.