Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complexity: An Introduction   This article summarises a Web-book on "Complexity" that was developed to
introduce undergraduate students to interesting complex systems in the
biological, physical and social sciences, and the common tools, principles and
concepts used for their study.

17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org