Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Truncation scheme of time-dependent density-matrix approach   A truncation scheme of the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy for
reduced density matrices, where a three-body density matrix is approximated by
the antisymmetrized products of two-body density matrices, is proposed. This
truncation scheme is tested for three model hamiltonians. It is shown that the
obtained results are in good agreement with the exact solutions.

13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics