Jacobian Determinant (det J)
< 0
1
> 2
The Jacobian Conjecture states that if a polynomial map from ℂ² to ℂ² has a constant non-zero Jacobian determinant, it has a polynomial inverse. Try to find a map with a constant Jacobian (uniform color) that folds over itself (not invertible).
u = x
v = y
v = y