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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: The first postulate is a truism.
Date: Sun, 22 Jun 2025 12:45:48 +0300
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On 2025-06-21 21:11:37 +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.
> How so?

Just think what the wrods mean. How do can you measure or at least
detect motion?

-- 
Mikko