Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of the Solutions of Instantaneous Bethe-Salpeter Equations
  with Confining Interactions   For two bound-state equations derived as simplified forms of the
Bethe-Salpeter equation with confining interaction, stability of all solutions
is rigorously shown.

1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin