Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dirac and Weyl fermions: from Gor'kov equations to Standard Model (in
  memory of Lev Petrovich Gorkov)   Gor'kov theory of superconductivity opened the application of the methods of
quantum field theory to condensed matter physics. Later the results became
relevant to relativistic quantum fields.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an