Groups > sci.physics.relativity > #582451

Re: Annotated version of SRT

From	Python <python@example.invalid>
Newsgroups	sci.physics.relativity
Subject	Re: Annotated version of SRT
Date	2022-04-10 12:54 +0200
Organization	Aioe.org NNTP Server
Message-ID	<t2ud0b$rl2$2@gioia.aioe.org> (permalink)
References	(18 earlier) <03a03595-b620-438c-939a-b1efadaa0d79n@googlegroups.com> <jba3mtFg7iqU1@mid.individual.net> <t2rukg$1qn8$1@gioia.aioe.org> <jbfd0cFgk3oU1@mid.individual.net> <786f45c1-b362-4680-8755-d47f73790e32n@googlegroups.com>

Show all headers | View raw

Maciej Wozniak wrote:
> On Sunday, 10 April 2022 at 08:49:52 UTC+2, 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.
> 
> Sometimes.
> 
>> (without a
>> corresponding coordinate system a vector would not make any sense at all.)
> 
> It would and it does.

Second time you're right Maciej, surprising.

Thomas confuses vectors with coordinates of vectors. I wonder if he ever
followed a course on linear algebra.

Back to sci.physics.relativity | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

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

csiph-web