Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Existence and multiplicity of positive weak solutions for a new class of
  $(p; q)$-Laplacian systems   The paper is concerned with the existence of positive weak solutions for a
new class of $\left( p,q\right) $-Laplacian elliptic systems in a bounded
domain by means of the method of sub-super solutions. Particularly, we do not
need any sign conditions for $\gamma \left( 0\right), g\left( 0\right), f\left(
0\right) $ and $h\left(0\right) $. Moreover, a multiplicity result is obtained
when $\gamma \left(0\right)=g\left( 0\right)=f\left( 0\right)=h\left(
0\right)=0.$ Finally, we give some examples to verify our main results.

34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg