Re: The first postulate is a truism.

On 2025-06-23 21:29:39 +0000, LaurenceClarkCrossen said:

On Sat, 21 Jun 2025 10:22:37 +0000, Mikko wrote:
 

On 2025-06-21 01:28:15 +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.

Do you think it is warranted for critics to interpret the first
postulate as including the assumption that all motion is relative?

 That all motion is relative is a consequence of the first postulate.

Then you equate the first postulate with an assertion that the aether
does not exist? If all motion is relative to a stationary aether what
motion is not relative?

It is not clear what "does not exist" actually means and how that could
be known. But Einstein clearly said that no aether is relevant to the
phenomena discussed in "On the Electrodynamics of Moving Bodies".
--
Mikko