Re: The first postulate is a truism.

J. J. Lodder wrote:

I did explain. And what I said was indeed known long before Einstein.
 
If the first postulate were a truism nobody would ever have believed
otherwise. But ancinet literature shows that the opposite belief was
common.

 
Indeed.
In particular Maxwell's equations were generally believed before 1905 to
hold only in one prefered frame. (the rest frame of the aether)
 
Einstein's postulate applied to electromagnetism was new and
revolutionary, and seen as such at the time,
(by those who mattered)

blatantly nonsense. The proof for aether is that it exists in vacuum. You
empty the vacuum of matter, aether still exists. And there is not
electromagnetism but resonance, as in air. Also, the Einstine was in the
business of stealing patents, like anyother jew, in return for academic
degrees.