Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective behavior of interacting self-propelled particles   We discuss biologically inspired, inherently non-equilibrium self-propelled
particle models, in which the particles interact with their neighbours by
choosing at each time step the local average direction of motion. We summarize
some of the results of large scale simulations and theoretical approaches to
the problem.

18
The categories of this paper are: econ
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph