Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lindeman's criterion: diamond graphitization temperature and its
  dependence on external pressure   A simple model for the "diamond graphitization" type of phase transition is
proposed, leading to a good agreement with the experimental data. The phase
transition temperature dependence on the external pressure is found. A new
phenomenon in diamond is predicted, which is a decrease of the temperature of
graphitization with increase of external pressure.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs