Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Many-body Dyson equation approach to the seniority model of pairing   As is well known, the single level seniority model of pairing has been solved
exactly since long using angular momentum algebra. It is shown that it can also
be solved using the Dyson equation of standard many-body theory. The formalism
shows some interesting many-body aspects.

19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin