Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The statistical mechanics of the classical two-dimensional Coulomb gas
  is exactly solved   The model under consideration is a classical 2D Coulomb gas of pointlike
positive and negative unit charges, interacting via a logarithmic potential. In
the whole stability range of temperatures, the equilibrium statistical
mechanics of this fluid is exactly solvable via an equivalence with the
integrable 2D sine-Gordon field theory. The exact solution includes the bulk
thermodynamics, special cases of the surface thermodynamics, and the
large-distance asymptotic behavior of the two-body correlation functions.

5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph