Tje tame and wild automorphisms of an affine quadric threefold

We prove the existence of wild automorphisms on an affine quadric threefold. The method we use is an adaptation of the one used by Shestakov and Umirbaev to prove the existence of wild automorphisms on the affine three dimensional space.

This is a joint work with S.Lamy.

Exposé dans les cadres du rencontre Journées de la géométrie affine à  Grenoble,
Grenoble 9-10 mai 2011