Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Centre, commutativite et conjugaison dans un graphe de groupe   We give characterizations of the center, of conjugated and of commuting
elements in a fundamental group of a graph of group. We deduce various results
: on the one hand we give a sufficient condition for the center, the
centralizers, and the root structures in such a group to be in some sense
trivial, and on the other hand we prove that for any group G, the conjugacy
problem reduces to the same problem in a double of G along any finite family of
subgroups.

23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin