Wild automorphisms of graded algebras (Антон Трушин - МГУ им. М.В. Ломоносова)
Доклад Антона Трушина (МГУ им. М. В. Ломоносова) на семинаре лаборатории алгебраических групп преобразований.
In 2004, Shestakov and Umirbaev proved that the Nagata automorphism of the polynomial algebra in three variables is wild. We fix a ℤ-grading on this algebra and consider graded-wild automorphisms, i.e. such automorphisms that cannot be decomposed onto elementary automorphisms respecting the grading. We describe all gradings allowing graded-wild automorphisms. We also discuss systems of automorphisms generating the group of graded automorphisms.