Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An unusual eigenvalue problem   We discuss an eigenvalue problem which arises in the studies of asymptotic
stability of a self-similar attractor in the sigma model. This problem is
rather unusual from the viewpoint of the spectral theory of linear operators
and requires special methods to solve it. One of such methods based on
continued fractions is presented in detail and applied to determine the
eigenvalues.

13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess