Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On certain elements and the center of the quasi-isometry groups of
  Euclidean spaces   We introduce the notion of $PL_\delta$- homeomorphism between two locally
finite simplicial complexes in $\mathbb{R}^n$ and give a sufficient condition
for a simplicial homeomorphism to be a quasi-isometry. We show that the center
of the group $QI(\mathbb{R}^n)$ of all quasi-isometries of $\mathbb{R}^n$ is
trivial.

24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph