Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matrix Lie Groups as 3-Dimensional Almost Paracontact Almost Paracomplex
  Riemannian Manifolds   Lie groups considered as three-dimensional almost paracontact almost
paracomplex Riemannian manifolds are investigated. In each basic class of the
classification used for the manifolds under consideration, a correspondence is
established between the Lie algebra and the explicit matrix representation of
its Lie group.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con