Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Runaway growth of fractal dust grains   Fractal grains have large surface area, which leads to more efficient
condensation. The special limit case where the volume-area ratio is constant
(corresponding to, e.g., a very rough grain surface or non-compacts aggregates)
is particularly interesting, as well as convenient, from a mathematical point
of view. If dust grains from AGB stars have `rough surfaces', it may have
important implications for our understanding of dust and wind formation in AGB
stars.

1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math