Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Note on the descriptions of the Euler-Poisson equations in various
  co-ordinate systems   In this note we derive the descriptions of the system of Euler-Poisson
equations which governs the hydrodynamic evolution of gaseous stars in various
co-ordinate systems. This note does not contain essentially new results for
astrophysicists, but mathematically rigorous derivations cannot be found in the
literatures written by physicists so that it will be useful to prepare details
of rather stupidly honest derivations of the equations in various flames when
we are going to push forward the mathematical research of the problem.

35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs