Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revision of the Selection Function of the Optical Redshift Survey using
  the Sloan Digital Sky Survey Early Data Release: Toward an Accurate Estimate
  of Source Number Density of Ultra-High Energy Cosmic Rays
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th