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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: [SR and synchronization] Cognitive Dissonances and Mental Blockage
Date: Thu, 22 Aug 2024 10:50:22 +0300
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On 2024-08-21 06:49:08 +0000, Thomas Heger said:

> Am Dienstag000020, 20.08.2024 um 13:00 schrieb Mikko:
> ...
>>>>>>> Relativity requires mutally symmetric methods. So if you synchronize 
>>>>>>> clock B with clock A, this must come to the same result, as if you 
>>>>>>> would synchronize clock A with clock B.
>>>>>> 
>>>>>> It is.
>>>>> 
>>>>> No, it is not!
>>>> 
>>>> It is. It is explained in my initial post : What is (AB)/c to you?
>>> 
>>> AB was actually meant as:
>> 
>> Note that in Einstein's text the definition of synchronity (page 894)
>> does not use AB. Lower on the same page AB has an overbar.
>> 
>>> distance from A to B,
>>> 
>>> even if A and B are in fact position vectors, hence AB would usually be 
>>> the scalar product of A and B (what is absurd).
>> 
>> A nad B are not position vectors, they are positions. Postions are not
>> vectors. AB with overbar is the standard notation for the distance btween
>> positions A and B.
> 
> In my version there were no overbars.

Your version is irrelevant. Einstein used overbar. But the equation that
is relevant to the current discussion does not use AB at all.

> But the actual positions cannot be used in equations anyhow, because 
> real material objects cannot be used in equations of any kind.

Position is not a real material object.

> It is just rediculus to regard the points themselves as part of an equation.

It is common to use the same word for the symbol and the thing denoted
by the symbol. For example the word "Thomas" is can refer to the name
"Thomas" itself.

-- 
Mikko