Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long time behavior of Alfv\'en waves in a flowing plasma: mathematical
  analysis on the generation of the magnetic island   In this paper, we consider the generation of magnetic island for the
linearized MHD equations around the steady flowing plasma with velocity field
$U_s=(u(y),0)$ and magnetic field $H_s=(b(y),0)$ in the finite channel.

21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex