Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Simple Derivation of the Einstein-Maxwell Field Equations from the 2nd
  Ordinary Exterior Differential of a Precursor to the Soldering Form   A simple derivation is given of the Einstein-Maxwell field equations from the
2nd ordinary exterior differential of a precursor to the soldering form for
n-dimensional differentiable manifolds having a general linear connection and
in 5-dimensional general relativity in particular.

1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio