Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equivalence of Descriptions of Gravity In Both Curved and Flat
  Space-time   It is proved in the manuscript that as long as the proper coordinate
transformation is introduced,, the equations of geodetic lines described in
curved space-time can be transformed into the dynamic equations in flat
space-time, that is to say, the Einstein theory of gravitation and other
theories based on the curved space-time can be identically transformed into
flat space-time to describe. As an example, the Schwarzschild solution of the
spherical symmetry gravitational field is transformed into flat space-time to
study. The results show that there exists no any singularity in the all
processes and the whole space-time including at the point r=0. So it seems more
rational to discuss the problems of gravitation in flat space-time.

6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an