Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a Characterization of Geodesic Trajectories and Gravitational Motions   We shall here discuss a characterization of geodesics trajectories. We shall
show that the action of the gravitational field on mass particles can be
essentially identified with the force that cannot be absolutely eliminated.
This leads to an alternative formulation of equivalence principle.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph