Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Approximate method of free energy calculation for spin system with
  arbitrary connection matrix   The proposed method of the free energy calculation is based on the
approximation of the energy distribution in the microcanonical ensemble by the
Gaussian distribution. We hope that our approach will be effective for the
systems with long-range interaction, where large coordination number q ensures
the correctness of the central limit theorem application. However, the method
provides good results also for systems with short-range interaction when the
number q is not so large.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th