Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compactness of the automorphism group of a topological parallelism on
  real projective 3-space   We conjecture that the automorphism group of a topological parallelism on
real projective 3-space is compact. We prove that at least the identity
component of this group is, indeed, compact.

9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs