Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the origin of superselection rules and different solutions of
  Thirring model   The normal forms of different one- and two- parametric solutions of Thirring
model are connected with each other by making use of generalized conformal
shift transformations. A new alternative sources of superselection rules are
shown and the ways of spontaneous symmetry breaking are discussed.

37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio