Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ball lightning as a possible manifestation of high-temperature
  superconductivity in Nature   In the superconducting medium the circular current supported by its own
magnetic field can exist giving rise to the possible underlying mechanism for
the ball lightning.

27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an