Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex dynamics, hidden attractors and continuous approximation of a
  fractional-order hyperchaotic PWC system   In this paper, a continuous approximation to studying a class of PWC systems
of fractionalorder is presented. Some known results of set-valued analysis and
differential inclusions are utilized. The example of a hyperchaotic PWC system
of fractional order is analyzed. It is found that without equilibria, the
system has hidden attractors.

3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin