Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automorphism groups of rational elliptic and quasi-elliptic surfaces in
  all characteristics   We study the groups of automorphisms of rational algebraic surfaces that
admit a relatively minimal pencil of curves of arithmetic genus one over an
algebraically closed field of arbitrary characteristic. In particular, we
classify such surfaces that admit non-trivial automorphisms that act trivially
on the Picard group. As an application, we classify classical Enriques surfaces
in characteristic $2$ that admit non-trivial numerically trivial automorphisms.

11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin