Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin transport, spin diffusion and Bloch equations in electron storage
  rings   We show how, beginning with the Fokker--Planck equation for electrons
emitting synchrotron radiation in a storage ring, the corresponding equation
for spin motion can be constructed. This is an equation of the Bloch type for
the polarisation density.

7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin