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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity
Subject: Re: Division by zero
Date: Wed, 5 Feb 2025 10:09:40 +0100
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Am Mittwoch000005, 05.02.2025 um 08:48 schrieb Mikko:
....
>>>> This is actually not true, because Einstein wrote this:
>>>>
>>>> " We first define τ as a function of x', y, z, and t. ..."
>>>
>>> No need to revise my comment. The problem was to determine τ from x, 
>>> y, z,
>>> and t. The variable x' is just an intermediate step in that process.
>>>
>>>> The meaning of x' was also not defined properly and I'm still 
>>>> chewing on the problem to estimate, which interpretation is actually 
>>>> correct.
>>>
>>> The definition x' was x' = x - vt, leaving no room for interpretations.
>>
>> If a variable x' as 'intermediate step' without a meaning would be 
>> introduced, then the equation is no longer a representation of the 
>> real world.
> 
> Irrelevant as Einstein defined x' when introduced it.
> 
Almost none of his variables were defined properly.

But Einstein wrote actually:

"If we place x'= x − vt"

'...we place ...' sounds like he meant some sort of position of 
something, which is placed there.

 From the context would fit 'position of a mirror on the x-axis of K', 
because a mirror could be placed there.

So far, so good.

But: if we place a mirror there, the equation does not fit!

This is so, because x is belonging to K, too, because it is a variable 
in Latin letters, which belong to K.

 From the context of x, we are able to assume, that the position of an 
event in K was meant with x, which has a certain x-coordinate, why x has 
a fixed value in K

But if we subtract v*t from that x, the position x' would move, while 
the placed mirror shouldn't.

So: what else was actually meant?


TH