Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On subsonic and subsonic-sonic flows with general conservatives force in
  exterior domains   In this paper, we study irrotational subsonic and subsonic-sonic flows with
general conservative forces in the exterior domains. The conservative forces
indicate the new Bernoulli law naturally. For the subsonic case, we introduce a
modified cut-off system depending on the conservative forces which needs the
varied Bers skill, and construct the solution by the new variational formula.
Moreover, comparing with previous results, our result extends the
pressure-density relation to the general case. Afterwards we obtain the
subsonic-sonic limit solution by taking the extract subsonic solutions as the
approximate sequences.

11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga