Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One common solution to the singularity and perihelion problems   Based on the kinetic energy theorem, as one of the fundamental theorems from
the classical mechanics, throughout the first part of the article an attempt
has been made to derive the mathematical model of a material point motion in
the three-dimensional spatial subspace of the integral four-dimensional
space-time continuum and in the field of action of an active force F.
Accordingly, with a view to surmounting the singularity problem on the one
hand, as well as the moving perihelion problem of the planets on the other, as
two acutely vexed questions within Newton's gravity concept, the paper ends
with modification of Newton's gravity concept itself.

2
The categories of this paper are: math
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex