Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleation in two dimensional Ising system: Classical theory and
  computer simulation   We have studied the nucleation in the two dimensional Ising model by Monte
Carlo simulation. The nucleation time has been studied as a function of the
magnetic field for various system sizes. The logarithm of the nucleation time
is found to be proportional to the inverse of the magnetic field.The crossover
field and time are studied as a function of system size. The observed
variations are consistent with the prediction of classical nucleation theory.

6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc