Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase-amplitude functional theory -- new ab initio calculation method
  for large size systems   New method for ab initio calculations of the properties of large size system
based on phase-amplitude functional is presented. It is shown that Schrodinger
equation for many electrons complex system including large size molecules, or
clusters and also periodic systems could be translated into functional of two
variables, attributed to many electron wavefunctions: phase and the amplitude
(i.e. square root of total electron density). The equations for the phase and
the amplitude are derived. The kinetic and Coulomb interaction energy are
expressed in function of these variables. The equations for one-electron
wavefunctions, necessary for the energy spectrum are derived using these two
variables.

4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg