Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to Improve Functionals in Density Functional Theory? ---Formalism
  and Benchmark Calculation---   We proposed in Ref. [arXiv:1812.09285v2] a way to improve energy density
functionals in the density functional theory based on the combination of the
inverse Kohn-Sham method and the density functional perturbation theory. In
this proceeding, we mainly focus on the results for the $ \mathrm{Ar} $ and $
\mathrm{Kr} $ atoms.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat