Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of three-and four-charge systems   A brief review is presented of the stability domain of three- and four-charge
ground-states when the constituent masses vary. Rigorous results are presented,
based on the scaling behavior and the convexity properties deduced from the
variational principle. They are supplemented by accurate numerical
computations.

37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th