Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automorphisms of pointless surfaces   For a geometrically rational surface X over an arbitrary field of
characteristic different from 2 and 3 that contains all roots of 1, we show
that either X is birational to a product of a projective line and a conic, or
the group of birational automorphisms of X has bounded finite subgroups. As a
key step in the proof, we show boundedness of finite subgroups in any
anisotropic reductive algebraic group over a perfect field that contains all
roots of 1. Also, we provide applications to Jordan property for groups of
birational automorphisms.

28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an