Re: The first postulate is a truism.

On 2025-06-20 18:55:34 +0000, LaurenceClarkCrossen said:

On Fri, 20 Jun 2025 9:06:49 +0000, Mikko wrote:
 

On 2025-06-19 17:37:29 +0000, LaurenceClarkCrossen said:
 

Perplexity:
 "The First Postulate of Special Relativity
 Statement of the First Postulate
 The first postulate of special relativity, also known as the principle
of relativity, states:
 The laws of physics are the same in all inertial frames of
reference."
  "truism
/ˈtrˌizƏm/  n. a statement that is obviously true and says nothing new
or interesting. —truistic/trˈistik/ adj." -Oxford American.

 The first postulate is not a truism. It is possible to imagine a world
where it is not true and to believe that we actually live in a such
world.

Your reply does not explain how it is not obviously true and nothing new
that wasn't already known long before Einstein.

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.
--
Mikko