Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superlinear perturbations of the eigenvalue problem for the Robin
  Laplacian plus an indefinite and unbounded potential   We consider a superlinear perturbation of the eigenvalue problem for the
Robin Laplacian plus an indefinite and unbounded potential. Using variational
tools and critical groups, we show that when $\lambda$ is close to a
nonprincipal eigenvalue, then the problem has seven nontrivial solutions. We
provide sign information for six of them.

27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat