Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lightlike real hypersurfaces of paraquaternionic manifolds   The main purpose of this paper is to give fundamental properties of real
lightlike hypersurfaces of paraquaternionic manifolds and to prove the
non-existence of real lightlike hypersurfaces in paraquaternionic space forms
under some conditions.

12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph