Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cumulant-based calculations of the correlation energy in a molecule   The problem of constructing a guaranteed convergent sequence of corrections
to the Hartree--Fock ground state energy of a molecule without storing the
many-electron wave function is considered. Several methods based on cumulants
are considered and it is shown that such a sequence is obtained by Lanczos
tridiagonalization, in which the elements of the tridiagonal matrix are
calculated through cumulants.

29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
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The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci