Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved method for partial-wave decomposition of two-pion exchange
  three-nucleon force   In this article an efficient method to calculate the matrix elements of
three-nucleon force is presented. The new method is improved version of
partial-wave decomposition presented in Few-Body Syst. 22 (1997) 107, which
simplifies expression to be evaluated and permits to reduce computational
effort as much as six times. Proposed method naturally applies to Faddeev-type
calculations but also can be used by any method relaying on partial-wave
decomposition.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin