Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Concentrations for nonlinear Schrodinger equation with magnetic
  potentials and constant electric potentials   This paper studies the concentration phenomena to nonlinear Schrodinger
equations with magnetic potentials and constant electric potentials. We find
that the magnetic field plays an important role in the location of
concentrations if the electric potential is constant. This is a completely new
result compared with the case of non-constant electric potentials.

18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg