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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: Space-time interval (2)
Date: Thu, 15 Aug 2024 12:33:17 +0300
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On 2024-08-13 12:46:55 +0000, Richard Hachel said:

> Le 13/08/2024 à 12:44, "Paul.B.Andersen" a écrit :
>> Den 12.08.2024 22:25, skrev Richard Hachel:
>>> 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.
>>> 
>>> Non : ds²=dl²-c²dt²
>> 
>> https://paulba.no/pdf/TwinsByMetric.pdf
>> Chapter 1.
> 
>  There are equations that are correct in your pdf, but also equations 
> that are incorrect.

When you say that there equations (or anything) that are not correct
you should identify at least one incorrect equation and tell how you
saw that it is not correct.

> Unfortunately, I don't have time to do a thorough search, and to circle 
> in red everything that is wrong and tell you why.

Instad, you had time to post a vague useless message.

-- 
Mikko