Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An immediate proof of the non-existence of GW's   In general relativity (GR) no observer is physically privileged. As a strict
consequence, it can be shown that the physical generation of gravitational
waves (GW's) is quite impossible.

26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con