Abstract:
We prove that a finite group acting by birational automorphisms of a nontrivial Severi-Brauer surface over a field of characteristic zero contains a normal abelian subgroup of index at most 3. Also, we find an explicit bound for the orders of such finite groups in the case when the base field contains all roots of 1.
Bibliography: 25 titles.
Keywords:
Severi-Brauer surface, group of birational automorphisms.
This research was carried out with the support of the HSE University Basic Research Program, Russian Academic Excellence Project “5-100”, the Young Russian Mathematics award, and the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS”.