Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Basic cosmology   Basic cosmology describes the universe as a Robertson-Walker model filled
with black-body radiation and no barionic matter, and as observational data it
uses only the value of the speed of light, the Hubble and deceleration
parameters and the black-body temperature at the present epoch. It predicts the
value of the next new parameter in the Hubble law.

18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph