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From: Python <python@invalid.org>
Newsgroups: sci.physics.relativity
Subject: Re: Space-time interval (2)
Date: Mon, 12 Aug 2024 23:16:33 +0200
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Le 12/08/2024 à 22:25, M.D. Richard "Hachel" Lengrand wrote:
> Le 12/08/2024 à 21:06, Python a écrit :
> 
>>> Finally, what is ds²? It is just -c².Tr²
>>
>> No! ds^2 = c^2 dt^2 - dl^2. 
> 
> LOL.
You'd better read about your own stupidity, Lengrand.

> Non : ds²=dl²-c²dt²

It doesn't matter, it is a matter of convention (+ +  + -) or (- + + +)

> If ds²=-Tr²c²

If by Tr you intend a proper time \tau it may or *not* be
possible to find a frame of reference where ds = -\tau^2 c^2.
It is impossible for space-like intervals.