Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An elliptic system with logarithmic nonlinearity   In the present paper we study the existence of solutions for some classes of
singular systems involving the p(x) and q(x) Laplacian operators. The approach
is based on bifurcation theory and subsupersolution method for systems of
quasilinear equations involving singular terms.

14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs