Professor Raymond Flood: "A consequence of Einstein's principle of relativity is that the speed of light in vacuum has the same value in two uniformly moving frames of reference."
https://youtu.be/IjRSYv7u3T4?t=304
Is the constancy of the speed of light a consequence of the principle of relativity?
Half of world's physicists: Yes!
The other half: Who cares?
See more he
https://twitter.com/pentcho_valev
Pentcho Valev