Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: III. The Permissible Equilibrium Polarisation Distribution in a Stored
  Proton Beam   We illustrate the use of the invariant spin field for describing permissible
equilibrium spin distributions in high energy spin polarised proton beams.}

35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph