The new counterexample to the Jacobian conjecture

As many of you have probably heard already, yesterday morning, Levent Alpöge tweeted that Fable had found a counterexample to the Jacobian Conjecture. Specifically, let Then the Jacobian of is easily checked to be . However, the map is generically three to one, not bijective. I’m sure many of you are playing with these polynomials […]