Groups > sci.physics.relativity > #582450

Re: Annotated version of SRT

From	Python <python@example.invalid>
Newsgroups	sci.physics.relativity
Subject	Re: Annotated version of SRT
Date	2022-04-10 12:51 +0200
Organization	Aioe.org NNTP Server
Message-ID	<t2ucsc$rl2$1@gioia.aioe.org> (permalink)
References	(19 earlier) <jb4ptjFffd0U1@mid.individual.net> <03a03595-b620-438c-939a-b1efadaa0d79n@googlegroups.com> <jba3mtFg7iqU1@mid.individual.net> <t2rukg$1qn8$1@gioia.aioe.org> <jbfd0cFgk3oU1@mid.individual.net>

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Thomas Heger wrote:
> Am 09.04.2022 um 14:36 schrieb Python:
>> Thomas Heger wrote:
>> ...
>>> E.g. Y was used as x-component in the electric field strength vector
>>> at point (x, y, z). That 'Y' is therefore a unitless number, because
>>> the n-tuple (X, Y, Z) 'inherits' its units from the coordinate system
>>> it belongs to.
>>
>> *facepalm*
>>
>> Well, Thomas let's apply this silly idea of yours that vector
>> components are unitless. If they are unitless their values
>> won't change if you switch from one unit system to another
>> one, right?
>>
>> There is a glass of water in front of me on the table. Taking
>> the room walls to define orthogonal axis I can represent the
>> position of the glass as a three dimension vector (distance
>> from left well, front wall and floor, right?
>>
>> Using SI (meters) I got (1, 1.50, .50)
>>
>> Using inches I got (38.37, 59.05, 19.68)
>>
>> It is weird for "unitless" numbers to behave that way,
>> isn't it?
> 
> A vector is meant as coordinates within a coordinate system. (without a 
> corresponding coordinate system a vector would not make any sense at all.)
> 
> Therefore your vector (1, 1.50, .50) 'inherits' the SI units from the 
> corresponding coordinate system, which is defined in term of SI units.
> 
> In such a coordinate system 1 unit of length in the x-direction, for 
> instance, is 1 m long.
> 
> Because the coordinate system is already 'normed', the n-tuple (1, 1.50, 
> .50) does not need additional units anymore.
> 
> Not to norm a coordinate system would not make sense, because 
> coordinates are multiples of the unit length used.
> 
> And because the coordinate system already 'knows' the units, the vectors 
> themselves do not need to know, how long one unit of length is, hence 
> carry only numerical values.
> 
> If you alter the norm of the coordinate system, you obviously need to 
> alter the numerical values, too, while the meant length would not change.
> 
> (If vectors carry also units, the system gets 'doubble normed', what is 
> not such a good idea.)

*faceplam*

> Now we could attatch a different coordinate system to a point, which 
> carry other units, like V/m for instance.
> 
> The field strength vector is then meant as as 'coordinates' in that 
> abstract coordinate system.
> 
> In this case we also do not need to assing units to the vector entries, 
> because that coordinate system already knows the units.
> 
> 
> 
> 
>>> But the x-component of the electric field is not a number.
>>
>> What is it then? A giraffe?
>>
> 
> 'Field' denotes something, what distributes in space.
> 
> In case of the electric field, the influence of a charge on the 
> surrounding space was meant.
> 
> This influence is meant with 'electric field'.
> 
> The strength of this influence is then called 'electric field strength'.
> 
> As this has a strength and a direction at all of the influenced points, 
> we can use vectors starting from these points.
> 
> Now we get two possibilities for what we mean by 'vector':
> 
> one is the n-tuple, which belongs to the mathematical description
> 
> one is the physical field strength, which has a certain strength and 
> direction at any point in space.
> 
> 
> The physical field strength seems to be decomposable into orthogonal 
> fractions, which behave like vector themselves.
> 
> These can be represented in mathematical form as a vector, too.
> 
> Therefore the y-component of the field vector (X, Y, Z) can be written 
> as (0, Y, 0). That is a vector, while Y is a number.
> 
> Now I would like to know, which of these interpretations it was, that 
> Einstein had in mind.
> 
> 
> TH

Thomas, an asinine answer from you was expected, but unwanted, and
is useless (if you don't admit being wrong, what you are): we already
know you are a unsufferable idiot.

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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 Thomas Heger <ttt_heg@web.de> - 2022-04-14 08:36 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-13 23:44 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-14 04:16 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-14 01:34 -0700
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-14 12:47 +0000
              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 Thomas Heger <ttt_heg@web.de> - 2022-04-14 08:21 +0200
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-14 14:38 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-14 07:47 -0700
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-14 15:26 +0000
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-14 15:42 +0000

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