Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Cosmic Microwave Background   I review the discovery of the temperature fluctuations in the cosmic
microwave background radiation. The underlying theory and the implications for
cosmology are reviewed, and I describe the prospects for future progress.

16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
19
The categories of this paper are: eess
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci