Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The four-fermion interaction in D=2,3,4: a nonperturbative treatment   A new nonperturbative approach is used to investigate the Gross-Neveu model
of four fermion interaction in the space-time dimensions 2, 3 and 4, the number
$N$ of inner degrees of freedom being a fixed integer. The spontaneous symmetry
breaking is shown to exist in $D=2,3$ and the running coupling constant is
calculated. The four dimensional theory seems to be trivial.

3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat