Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Totalistic two-dimensional cellular automata exhibiting global periodic
  behavior   We have determined families of two-dimensional deterministic totalistic
cellular automaton rules whose stationary density of active sites exhibits a
period two in time. Each family of deterministic rules is characterized by an
``average probabilistic totalistic rule'' exhibiting the same periodic
behavior.

35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs