Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stresses, energy flow and energy density of gravitational nature   Two arguments which show the validity of the concept of gravitational energy
put forward by Lorentz and Levi-Civita.

17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an