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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: The first postulate is a truism.
Date: Sat, 21 Jun 2025 13:22:37 +0300
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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.

-- 
Mikko