Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometric Algorithms for Identifying and Reconstructing Galaxy Systems   The theme of this book chapter is to discuss algorithms for identifying and
reconstructing groups and clusters of galaxies out of the general galaxy
distribution. I review the progress of detection techniques through time, from
the very first visual-like algorithms to the most performant geometrical
methods available today. This will allow readers to understand the development
of the field as well as the various issues and pitfalls we are confronted with.
This essay is drawn from a talk given by the author at the conference "The
World a Jigsaw: Tessellations in the Sciences" held at the Lorentz Center in
Leiden. It is intended for a broad audience of scientists (and so does not
include full academic referencing), but it may be of interest to specialists.

12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ