Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ends and simple coarse structures   This paper is devoted to introducing coarse structures in a very simple way,
namely as an equivalence relation on the set of simple ends. As an application
we show that Gromov boundary of every hyperbolic space is an example of a
Higson corona and each Freundenthal compactification is an example of a Higson
compactification.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th