Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Torsion normal generators of the mapping class group of a non-orientable
  surface   We show that the normal closure of any periodic element of the mapping class
group of a non-orientable surface whose order is greater than 2 contains the
commutator subgroup, which for $g\geq 7$ is equal to the twist subgroup, and
provide necessary and sufficient conditions for the normal closures of
involutions to contain the twist subgroup. Finally, we provide a criterion for
a periodic element to normally generate $\mathcal{M}(N_g)$ and give examples.

24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat