Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global analysis of an infection age SEI model with a large class of
  nonlinear incidence rates   We propose and investigate an SEI infection's age model with a general class
of nonlinear incidence rates. We give a necessary and sufficient condition for
global asymptotic stability of the free-equilibrium related to the basic
reproduction number. By using Lyapunov functionals, we show the global
asymptotic stability of the endemic equilibrium whenever it exists.

26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin