Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: (A note on) self-similarity in granular media   It is shown that the phenomenon of self-similarity appears in granular media,
with an intergrain potential $V \propto \delta^{p+1}$, $p > 1$, where $\delta$
is the overlap between the grains. Although this fact can be traced back in the
literature, this has not been put explicitly.

14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci