Groups > sci.physics.relativity > #582301

Re: Annotated version of SRT

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: Annotated version of SRT
Date	2022-04-09 08:08 +0200
Message-ID	<jbcm7iFr8jU1@mid.individual.net> (permalink)
References	(18 earlier) <03a03595-b620-438c-939a-b1efadaa0d79n@googlegroups.com> <jba3mtFg7iqU1@mid.individual.net> <6764db6a-256b-46c2-83ca-ab2d74811565n@googlegroups.com> <jbbeghFo9obU1@mid.individual.net> <t2qf3s$uqr$1@gioia.aioe.org>

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Am 09.04.2022 um 01:05 schrieb Michael Moroney:

>>>> Usually the author should say, how he likes his symbols to be
>>>> understood.
>>>
>>> It's completely specified in the paper.
>>>
>>>> But since Einstein did not define his variables,
>>>
>>> He did.
>>
>> Sure. Actually he did that occasionally.
>>
>> But he used the symbol 'Y' for different purposes and in case of the
>> electric field strength vectors he left the question open, how that
>> 'Y' should be interpreted.
>>
>> Meant was the y-component of the field strength vector at point (x,y, z).
>>
>> But what he meant was most likely also a vector, but with only one
>> entry: something like (0, Y, 0).
>
> Again, to simplify the example of an object moving at right angles to a
> magnetic field, with axes defined appropriately (direction of motion
> along X axis, magnetic field along Y axis).  No need to involve
> complexity needing the cross product etc.

Totally wrong!

The effect on a moving charge by a magnetic field is usually described 
by vectors and cross products.

The cross product is also not such an advanced tool, that nobody can 
actually use it.

> You have been told this many times, yet you ignore this.


Sure, I ignored your useless statement, because it is totally wrong.

>> The symbol 'Y' could have other meanings, too:
>>
>> for instance the y-axis of the stationary system K had the name 'Y', too.
>
> In a different part of the paper.  Here it is defined differently.


This is VERY BAD !!!! practise!.

You should NOT redefine used symbols within a scientific paper without 
good reasons to do so.

There are tons of possibilities to name things with symbols, which you 
can maintain throughout the entire paper.

E.g. sub- or superscripts are a possibility or  hooks, ~, *, ° or other 
signs like arrows or under- or overlines, different fonts, different 
alphabets, upper- and lower-case and so forth.


There is absolutely no need to reuse the same symbol for other purposes 
somewhere later in the same text.

But Einstein used the same symbol 'X' with different meanings in the 
same sentence.

To me that was EXTREMLY BAD habit!


>> (0, Y, 0) is a symbolic representation in form of a n-tupel of the
>> field strength at a certain point inspace.
>>
>> The entries are numbers without units. But that can hardly be meant,
>> because a number is not a physical quantity.
>>
>> So: what was meant instead?
>
> Obviously, the strength of the magnetic field in the Y direction.

Sure, but this was not my question.

My question was, what kind of mathematical object 'Y' meant.

(0, Y, 0) is a vector, while the entry 'Y' in this vector is a number.

So: was the symbol 'Y' in Einstein's equations meant as a vector or as a 
number (or what else)?

This is important, because the validity of the equations rests upon the 
type of mathematical object of 'Y'.

>> Einstein left the question to the reader, who was therefore forced to
>> imagine, what Einstein had in mind.
>
> Once again, you are not Einstein's target audience.  His actual
> audience, physicists of his time, knew what Einstein was talking about,
> and didn't need to imagine anything.


I certainly would agree, that Einstein had not written for me.

But to write something in a scientific paper always adresses the general 
public.

Scientific papers are nothing like club magazines, which are distributed 
only among the members of a club.

Scientific papers are meant as publication of scientific discoveries to 
whom ever that may concern.

...


TH

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Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-03 15:42 -0400
  Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-04 07:20 +0200
    Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-04 13:10 +0200
    Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-04 13:55 +0000
      Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-05 08:35 +0200
        Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-05 10:28 +0200
          Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-05 03:15 -0700
            Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-06 08:01 +0200
        Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-05 14:56 +0000
          Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-05 14:03 -0400
            Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-05 18:06 +0000
              Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-07 07:48 +0200
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-07 13:25 +0000
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 07:59 +0200
                Re: Annotated version of SRT Mitch Yamaguchi <sdvw@aozrihai.wg> - 2022-04-07 19:23 +0000
                Re: Annotated version of SRT thor stoneman <consequently7990662@gmail.com> - 2022-04-07 14:10 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 07:56 +0200
        Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-05 13:58 -0400
          Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-06 08:22 +0200
            Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-07 07:45 +0200
              Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 01:20 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 08:14 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 23:47 -0700
            Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 01:06 -0700
              Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 08:40 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 23:56 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 20:50 +0200
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-08 19:05 -0400
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-09 08:08 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-08 23:51 -0700
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-09 13:02 +0000
                Re: Annotated version of SRT Coke Hishikawa <uhva@blseummh.nm> - 2022-04-09 13:21 +0000
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-09 12:18 -0400
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 09:14 +0200
                Re: Annotated version of SRT Mikko <mikko.levanto@iki.fi> - 2022-04-10 11:29 +0300
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-10 12:28 +0200
                Re: Annotated version of SRT Mikko <mikko.levanto@iki.fi> - 2022-04-10 16:54 +0300
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-11 00:50 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 21:52 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 07:42 +0200
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-11 11:01 +0000
                Re: Annotated version of SRT Paparios <mrios@ing.puc.cl> - 2022-04-11 05:50 -0700
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-11 18:20 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 09:48 -0700
                Re: Annotated version of SRT Paparios <mrios@ing.puc.cl> - 2022-04-11 09:54 -0700
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 12:32 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-11 18:39 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:28 -0700
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-12 06:36 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:38 -0700
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-12 06:47 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:58 -0700
                Re: Annotated version of SRT Richard Hachel <r.hachel@tiscali.fr> - 2022-04-12 11:14 +0000
                Re: Annotated version of SRT Richard Hachel <r.hachel@tiscali.fr> - 2022-04-12 11:10 +0000
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-11 12:38 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-12 18:48 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-12 11:37 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-13 02:37 -0400
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 13:06 +0200
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-09 07:48 +0200
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-09 14:36 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-09 06:18 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 08:49 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-09 23:52 -0700
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 12:54 +0200
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 12:51 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 05:02 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 21:04 +0200
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 22:08 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 21:20 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 07:48 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-11 08:43 +0000
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-11 13:55 +0200
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 21:09 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-12 02:52 +0000
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-13 07:49 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-13 07:41 +0000
          Re: Annotated version of SRT Coke Hishikawa <uhva@blseummh.nm> - 2022-04-09 11:33 +0000
            Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-09 13:08 -0700
              Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-10 11:54 +0200
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 21:10 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-11 12:43 -0700
    Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-04 21:02 -0400

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