Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Crystal Structure and Pair Potentials: A Molecular-Dynamics
  Study"   The dynamical equations for particles in the Parrinello-Rahman Molecular
Dynamics were compared with the Newton's Second Law. The discrepancy is due to
using the in-complete particles' kinetic energy in the Lagrangian.

16
The categories of this paper are: stat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys