Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The network approach: basic concepts and algorithms   What is a complex network? How do we characterize complex networks? Which
systems can be studied from a network approach? In this text, we motivate the
use of complex networks to study and understand a broad panoply of systems,
ranging from physics and biology to economy and sociology. Using basic tools
from statistical physics, we will characterize the main types of networks found
in nature. Moreover, the most recent trends in network research will be briefly
discussed.

23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th