Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional stability analysis in a HIV model with quadratic
  logistic growth term   We consider a Human Immunodeficiency Virus (HIV) model with a logistic growth
term and continue the analysis of the previous article [6]. We now take the
viral diffusion in a two-dimensional environment. The model consists of two
ODEs for the concentrations of the target T cells, the infected cells, and a
parabolic PDE for the virus particles. We study the stability of the uninfected
and infected equilibria, the occurrence of Hopf bifurcation and the stability
of the periodic solutions.

17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg