Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Confinement and monopole condensation: some properties of the disorder
  parameter   We demonstrate that the disorder parameter $<\mu>$ to detect dual
superconductivity in the confining phase of QCD is the v.e.v. of a magnetically
charged, Dirac like, gauge invariant operator $\mu$. We also show that the
abelian projection on the lattice is determined up to terms O(a^2) (a = lattice
spacing).

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th