Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A historical introduction to the symmetries of magnetic structures: Part
  1. Early quantum theory, neutron powder diffraction and the colored space
  groups   This paper introduces the historical development of the symmetries for
describing magnetic structures culminating in the derivation of the black and
white and colored space groups. Beginning from the Langevin model of the Curie
law, it aims to show the challenges that magnetic ordering presented and how
different symmetry frameworks were developed to meet them. As well as
explaining core ideas, later papers will show how the different schemes are
connected. With these goals in mind, the maths related is kept to the minimum
required for clarity.

2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc