Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on subgroups of the Loch Ness Monster Surface's Mapping Class
  Group   In this short note we give an elementary proof of the fact that every
countable group is a subgroup of the mapping class group of the Loch Ness
monster surface.

26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th