Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Primitivity of group rings of non-elementary torsion-free hyperbolic
  groups   We use a recent result of Alexander and Nishinaka to show that if $G$ is a
non-elementary torsion-free hyperbolic group and $R$ is a countable domain,
then the group ring $RG$ is primitive. This implies that the group ring $KG$ of
any non-elementary torsion-free hyperbolic group $G$ over a field $K$ is
primitive.

19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph