Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rigidity property of diagram groups   We show a rigid connection between two classical objects: the R.Thompson
group F and the Dunce hat. A diagram group of a directed 2-complex contains a
copy of F if and only if the complex contains a copy of the Dunce hat.

33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci