Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Friction and Nonlinear Dynamics   The nonlinear dynamics associated with sliding friction forms a broad
interdisciplinary research field that involves complex dynamical processes and
patterns covering a broad range of time and length scales. Progress in
experimental techniques and computational resources has stimulated the
development of more refined and accurate mathematical and numerical models,
capable of capturing many of the essentially nonlinear phenomena involved in
friction.

16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph