Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A comment on the Invariance of the Speed of Light   The invariance of the speed of light in all inertial frames is shown to be an
inevitable consequence of the relativity principle of special relativity
contrary to the view held by Hsu and Hsu in taiji relativity where the speed of
light is no longer a universal constant. The present approach is not only new
but also much simpler than the existing approaches.

13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio