Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A systolic inequality for 2-complexes of maximal cup-length and systolic
  area of groups   We extend a systolic inequality of Guth for Riemannian manifolds of maximal
$\mathbb{Z}_2$ cup-length to piecewise Riemannian complexes of dimension 2. As
a consequence we improve the previous best universal lower bound for the
systolic area of groups for a large class of groups, including free abelian and
surface groups, most of irreducible 3-manifold groups, non-free Artin groups
and Coxeter groups (or more generally), groups containing an element of order
2.

3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th