Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The statistical dynamics of classic particles ensemble in gravitational
  field   The article is the translation of authors paper, printed earlier in
inaccessible edition and devoted to the formulation of basic concepts of
dynamic description of particles' statistic ensemble in a gravitational field.
Later on, the results of this article were used by numbers of authors in papers
of relativistic kinetics.

2
The categories of this paper are: math
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph