Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbitron. Part II. Magnetic levitation   This paper devoted to proof the existence of stable quasi-periodic motions of
the magnetic dipole that is under the action of the external magnetic field and
homogeneous field of gravity. For proof this we used the group-theoretic
methods of Hamiltonian mechanics, viz energy-momentum method. Numerical
simulation shows the possibility of realization of stable motions with
physically reasonable parameters of the system.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph