Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Derivation of the magnetization current from the non-relativistic Pauli
  equation: A comment on "The quantum mechanical current of the Pauli equation"
  by Marek Nowakowski [Am.J.Phys.67(10), 916-919 (1999)]   The magnetization current that appears in the non-relativistic limit of the
Dirac equation is derived starting from the Pauli equation.

7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin