Re: The first postulate is a truism.

On Mon, 23 Jun 2025 8:43:48 +0000, Mikko wrote:

On 2025-06-22 11:25:52 +0000, J. J. Lodder said:
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Mikko <mikko.levanto@iki.fi> wrote:
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On 2025-06-19 17:37:29 +0000, LaurenceClarkCrossen said:
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Perplexity:
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"The First Postulate of Special Relativity
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Statement of the First Postulate
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The first postulate of special relativity, also known as the principle
of relativity, states:
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The laws of physics are the same in all inertial frames of
reference."
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"truism
/?tr?iz?m/  n. a statement that is obviously true and says nothing new
or interesting. —truistic/tr?istik/ adj." -Oxford American.

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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.

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Applying 'truism' to postulate is a category error anyway,
(but what do we expect from dear Laurence?)

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I think the (mistaken) idea was that if it is a truism it is wrong
to call it a postulate.

I agree. It is mistaken to think a truism cannot be a postulate. Look at
the first postulate.