Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Billiards, invariant measures, and equilibrium thermodynamics. II   The kinetics of collisionless continuous medium is studied in a bounded
region on a curved manifold. We have assumed that in statistical equilibrium,
the probability distribution density depends only on the total energy. It is
shown that in this case, all the fundamental relations for a multi-dimensional
ideal gas in thermal equilibrium hold true.

19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con