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”.