Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple weak solutions for a kind of time-dependent equation involving
  singularity   The existence of at least three weak solutions for a kind of nonlinear
time-dependent equation is studied. In fact, we consider the case that the
source function has singularity at origin. To this aim, the variational methods
and the well-known critical points theorem are main tools.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph