Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Which infinite abelian groups admit an almost maximally almost-periodic
  group topology?   A topological group G is said to be almost maximally almost-periodic if its
von Neumann radical is non-trivial, but finite. In this paper, we prove that
every abelian group with an infinite torsion subgroup admits a (Hausdorff)
almost maximally almost-periodic group topology. Some open problems are also
formulated.

15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th