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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: The first postulate is a truism.
Date: Tue, 24 Jun 2025 12:54:08 +0300
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On 2025-06-23 13:32:06 +0000, LaurenceClarkCrossen said:

> On Sun, 22 Jun 2025 11:25:52 +0000, J. J. Lodder wrote:
> 
>> Mikko <mikko.levanto@iki.fi> 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
>>>> /?tr?iz?m/  n. a statement that is obviously true and says nothing new
>>>> or interesting. —truistic/tr?istik/ 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.
>> 
>> Applying 'truism' to postulate is a category error anyway,
>> (but what do we expect from dear Laurence?)
>> 
>> Jan

> Speaking of category errors, why didn't Einstein make his first
> postulate:
> "The laws of electromagnetism are the same in all frames of reference."

Because the main open problem at the time was whether they can be the
same in frames that are in uniform linear motion with respect to each
other. Accelerating frames are not relevant to that problem.

-- 
Mikko