Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Family of solutions for axisymmetric electrovacuum Einstein-Maxwell
  field equations   We present a family of solutions for the axisymmetric Plebanski-Demianski
metric and other corresponding reduced metrics. We also present the black hole
characteristics using a new set of parameters for Kerr-Newman metric.

37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int