Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Summation of Parquet diagrams as an ab initio method in nuclear
  structure calculations   In this work we discuss the summation of the Parquet class of diagrams within
Green's function theory as a possible framework for ab initio nuclear structure
calculations. The theory is presented and some numerical details are discussed,
in particular the approximations employed. We apply the Parquet method to a
simple model, and compare our results with those from an exact solution. The
main conclusion is that even at the level of approximation presented here, the
results shows good agreement with other comparable ab initio approaches.

20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat