Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A characterization of quaternionic Kleinian groups in dimension 2 with
  complex trace fields   Let $G$ be a non-elementary discrete subgroup of $\mathrm{Sp}(2,1)$. We show
that if the sum of diagonal entries of each element of $G$ is a complex number,
then $G$ is conjugate to a subgroup of $\mathrm{U}(2,1)$.

24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph