Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Variational look at QCD   I discuss the applicability of variational methods to the study of
non-perturbative aspects of QCD. An illustration of the capabilities of the
method pioneered by Kogan and Kovner is given through the analysis of the
deconfinement phase transition in gluodynamics in 3+1 dimensions.

1
The categories of this paper are: cs
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom