Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Matter: Early Considerations   A review of the study of dark matter is given, starting with earliest studies
and finishing with the establishment of the standard Cold Dark Matter paradigm
in mid 1980-s. Particular attention is given to the collision of the classical
and new paradigms concerning the matter content of the Universe. Also the
amount of baryonic matter, dark matter and dark energy is discussed using
modern estimates.

26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg