Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of peakons for a modified Camassa-Holm equation   In this paper, we investigate the orbital stability of peakons for a modified
Camassa-Holm equation with cubic nonlinearity derived from the two-dimensional
Euler equation. By overcoming the difficulties caused by one of the complicated
conservation laws and introducing a new auxiliary function, we prove the
orbital stability of peakons for the equation.

13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th