Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A strongly universal cellular automaton on the heptagrid with seven
  states   In this paper, we prove that there is a strongly universal cellular automaton
on the heptagrid with seven states which is rotation invariant. This improves a
previous paper of the author where the automaton required ten states.

29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th