Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarized Gluons in the Nucleon   QCD suggests that gluons in the nucleon play an important role in {\it
so-called} ``the proton spin problem''. In this talk, the behavior of the
polarized gluon distribution in the nucleon is discussed by using the
positivity condition of distribution functions together with the unpolarized
and polarized experimental data.

9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics