Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Small Parameter Method for Few-Body Problems   A procedure to solve few-body problems which is based on an expansion over a
small parameter is developed. The parameter is the ratio of potential energy to
kinetic energy in the subspace of states having not small hyperspherical
quantum numbers, K>K_0. Dynamic equations are reduced perturbatively to those
in the finite subspace with K \le K_0. The contribution from the subspace with
K>K_0 is taken into account in a closed form, i.e. without an expansion over
basis functions.

17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an