Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic and Nonrelativistic Descriptions of Electron Energy Levels
  in a Static Magnetic Field   The physical consequences of the relativistic and nonrelativistic approaches
to describe the energy levels of electrons which propagate in a static
homogeneous magnetic field are considered. It is shown that for a given
strength of the magnetic field, the quantized energy levels of the electrons
calculated by nonrelativistic and relativistic equations differ substantially,
up to few orders of magnitude for a magnetic field of about 1 Tesla.
Experimental verification to resolve the discrepancy would be very welcome.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat