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Re: New rewritten version of 'annotated version of SRT'

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Mikko wrote:

> On 2022-02-13 08:15:27 +0000, Thomas Heger said:
>> Am 13.02.2022 um 08:42 schrieb Michael Moroney:
>>> You don't even know of the ordinary multiplication sign "×"? Really?
>> Well, ordinary people may use it for multiplication.
>> 
>> But theoretical physics is another kind of thing, where symbols are
>> much more complicated than for common mortals.
>> 
>> In theoretical physics there exist several types of multiplications,
>> for which different symbols are used. The 'x' used for multiplication
>> means 'cross product' and nothing else.
> 
> Do you know any scientific article written in German before World War I
> that uses "x" for cross product?

I am not sure that this is true either.

To clarify, if Einstein even wrote that, he simply did not mean the 
cross/*vector* product as he *knew* (because by contrast to his critics here 
he did study Physics at a university) that mass is *scalar* quantity.  This 
is just another example of the Dunning–Kruger effect where the incompetent 
(Thomas Heger, and probably you) have a cognitive bias that causes them to 
underestimate the competence of others/experts (Albert Einstein):

<https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect>

“×” is standardized as the Unicode character U+00D7 MULTIPLICATION SIGN, and 
although writing the operator for the scalar/standard product as U+00B7 
MIDDLE DOT „·“ or (preferred in Unicode) U+22C5 DOT OPERATOR „⋅“, and that 
for the vector product as „ד, in German-speaking mathematics (which I know 
Thomas Heger is familiar with, although only superficially), given the 
understanding of „ד in English-speaking primary school mathematics, it is 
quite possible that this is a newer development.

See also: <https://en.wikipedia.org/wiki/Multiplication_sign>


PointedEars
-- 
Heisenberg is out for a drive when he's stopped by a traffic cop. 
The officer asks him "Do you know how fast you were going?" 
Heisenberg replies "No, but I know where I am."
(from: WolframAlpha)

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New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:18 +0100
  Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:23 +0100
    Re: New rewritten version of 'annotated version of SRT' Darrel Angus <argus@iiehdc.mx> - 2022-02-12 19:43 +0000
  Crank Thomas Heger perseveres "Dono." <eggy20011951@gmail.com> - 2022-02-12 11:38 -0800
    Re: Crank Dontknow perverses Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:48 +0100
      Re: Crank Dontknow perverses Darrel Angus <argus@iiehdc.mx> - 2022-02-12 21:19 +0000
      Re: Crank Dontknow perverses "Dono." <eggy20011951@gmail.com> - 2022-02-12 15:21 -0800
        Re: Crank Dontknow perverses Richard Hachel <r.hachel@tiscali.fr> - 2022-02-13 00:01 +0000
  Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-12 20:26 +0000
  Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-12 22:12 +0000
    Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 08:19 +0100
      Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 02:42 -0500
        Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 09:15 +0100
          Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
          Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 12:57 -0500
            Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-14 08:24 +0100
              Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-14 14:13 +0000
              Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-14 18:48 -0500
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:52 +0100
                Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-17 03:23 -0500
                Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-17 00:28 -0800
          Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-02-14 10:16 +0200
            Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-14 14:01 +0100
              Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-15 10:49 +0100
                Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-02-15 13:28 +0100
                Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-15 05:09 -0800
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-16 07:38 +0100
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-15 14:01 +0000
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-16 07:45 +0100
                Cretin Thomas Heger perseveres "Dono." <eggy20011951@gmail.com> - 2022-02-15 22:54 -0800
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-16 13:32 +0000
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:27 +0100
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-17 13:57 +0000
                Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-02-16 13:12 +0200
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:34 +0100
            Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-14 14:34 +0100
        Re: New rewritten version of 'annotated version of SRT' "Dono." <eggy20011951@gmail.com> - 2022-02-14 16:35 -0800
      Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-02-13 09:36 +0100
        Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-13 19:08 +0100
          Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 17:09 -0500
      Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
  Re: New rewritten version of 'annotated version of SRT' JanPB <filmart@gmail.com> - 2022-02-12 23:04 -0800
    Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 09:17 +0100
      Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
        Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-13 05:54 -0800
      Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 10:35 -0500
      Re: New rewritten version of 'annotated version of SRT' JanPB <filmart@gmail.com> - 2022-02-13 13:31 -0800

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