Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On stability, persistence and Hopf bifurcation of fractional order
  dynamical system   This is a preliminary study for bifurcation in fractional order dynamical
systems. Stability, persistence and hopf bifurcation are studied. Some studies
are also done for functional equations.

36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ