Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global geometry of space-time with the charged shell   It is elaborated the complete classification of the possible types of the
spherically symmetric global geometries for two types of electrically charged
shells: (1) The charged shell as a single source of the gravitational field,
when internal space-time is flat, and external space-time is the
Reissner--Nordstr\"om metric; (2) The neutralizing shell with an electric
charge opposite to the charge of the internal source with the
Reissner--Nordstr\"om metric and with the Schwarzschild metric outside the
shell.

25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys