Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Addendum to the paper "Two-Dimensional Infinite Prandtl Number
  Convection: Structure of Bifurcated Solutions, J. Nonlinear Sci., 17(3),
  199-220, 2007"   The main objective of this addendum to the mentioned article by Park is to
provide some remarks on bifurcation theories for nonlinear partial differential
equations (PDE) and their applications to fluid dynamics problems. We only wish
to comment and list some related literatures, without any intention to provide
a complete survey.

7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ