Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remarks on global existence of classical solution to multi-dimensional
  compressible Euler-Poisson equations with geometrical symmetry   We give a necessary and sufficient condition for the global existence of the
classical solution to the Cauchy problem of the compressible Euler-Poisson
equations with radial symmetry. We introduce a new quantity which describes the
balance between the initial velocity of the flow and the strength of the force
governed by Poisson equation.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics