Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the arboreal structure of right-angled Artin groups   The present article continues the study of median groups initiated in [6, 9,
10]. Some classes of median groups are introduced and investigated with a
stress upon the class of the so called A-groups which contains as remarkable
subclasses the lattice ordered groups and the right-angled Artin groups. Some
general results concerning A-groups are applied to a systematic study of the
arboreal structure of right-angled Artin groups. Structure theorems for
foldings, directions, quasidirections and centralizers are proved.

28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
16
The categories of this paper are: stat