Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface fraction of random close packing in two dimensions calculated
  exactly   The random close packing fraction in two dimensions is calculated exactly via
the central limit theorem and the brownian motion with no gain between
monodisperse disks.

19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs