Groups > sci.physics.relativity > #386255

Re: Is euclidean geometry falsified?

From	Sylvia Else <sylvia@not.at.this.address>
Newsgroups	sci.physics.relativity
Subject	Re: Is euclidean geometry falsified?
Date	2016-06-20 10:56 +1000
Message-ID	<dsot9cFg9lvU1@mid.individual.net> (permalink)
References	<002a6a7b-7bb0-488f-8f19-4a5514309669@googlegroups.com> <n7udnWz8heXXjvnKnZ2dnUU7_8zNnZ2d@giganews.com> <nk16ii$cho$1@node2.news.atman.pl> <dsjrqlFg5n0U1@mid.individual.net> <nk48uf$bml$1@node2.news.atman.pl>

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On 19/06/2016 5:54 AM, Maciej Woźniak wrote:
>
>
> Użytkownik "Sylvia Else"  napisał w wiadomości grup
> dyskusyjnych:dsjrqlFg5n0U1@mid.individual.net...
>
> |Euclidean geometry is not a theory; it's a set of axioms from which
> |theorems (not theories!) can be derived. The statement "Euclidean
> |geometry accurately models the world" is a theory, and it's also easily
> |refutable. But that doesn't falsify Euclidean geometry itself.
>
> Madame, get conscious.
> Take almost any of its theorems. Pythagorean? Is it possible
> to measure 3 distances and one angle,  calculate a*a+b*b and
> test, whether it is c*c or is it impossible.

If the axioms hold, then so does Pythagoras, since that it is a theorem. 
If you find by measurement that Pythagoras does not hold, then that just 
tells you that your geometry is not Euclidean. It says something about 
your geometry, but it has nothing to say about the validity of Euclidean 
geometry.

Sylvia.

Thread

Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-16 01:07 -0700
  Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-16 04:20 -0700
    Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-16 04:36 -0700
    Re: Is euclidean geometry falsified? Odd Bodkin <bodkinodd@gmail.com> - 2016-06-20 12:16 -0500
      Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-20 22:38 -0700
        Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-20 23:23 -0700
        Re: Is euclidean geometry falsified? Odd Bodkin <bodkinodd@gmail.com> - 2016-06-21 08:36 -0500
          Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-21 07:02 -0700
          Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-21 07:06 -0700
            Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-22 11:52 +1000
              Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-27 09:50 -0700
  Re: Is euclidean geometry falsified? Rafael Valls Hidalgo-Gato <rvalls162@gmail.com> - 2016-06-16 06:37 -0700
  Re: Is euclidean geometry falsified? Tom Roberts <tjroberts137@sbcglobal.net> - 2016-06-17 10:12 -0500
    Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-17 17:34 +0200
      Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-18 03:11 -0700
    Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-17 17:55 +0200
      Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-18 13:00 +1000
        Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:54 +0200
          Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-20 10:56 +1000
            Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-19 23:09 -0700
              Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-20 19:19 +1000
                Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-20 02:43 -0700
      Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-18 03:14 -0700
        Re: Is euclidean geometry falsified? Virgil <VIRGIL@VIRGIL.com> - 2016-06-18 10:41 -0600
        Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:58 +0200
    Re: Is euclidean geometry falsified? Rafael Valls Hidalgo-Gato <rvalls162@gmail.com> - 2016-06-17 14:27 -0700
      Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-17 23:46 +0200
        Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-17 15:33 -0700
          Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:30 +0200
      Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-17 15:45 -0700
        Re: Is euclidean geometry falsified? A Nony Mouse <abc@cef.ghi> - 2016-06-17 17:08 -0600
          Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:38 +0200
        Re: Is euclidean geometry falsified? Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 16:12 -0700
          Re: Is euclidean geometry falsified? A Nony Mouse <abc@cef.ghi> - 2016-06-17 18:39 -0600
            Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:40 +0200
              Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-18 15:17 -0700
        Re: Is euclidean geometry falsified? RichD <r_delaney2001@yahoo.com> - 2016-06-21 09:45 -0700
      Re: Is euclidean geometry falsified? Tom Roberts <tjroberts137@sbcglobal.net> - 2016-06-19 12:06 -0500
        Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-19 20:50 +0200
          Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-20 12:16 +1000
            Re: Is euclidean geometry falsified? Virgil <VIRGIL@VIRGIL.com> - 2016-06-19 22:15 -0600
              Re: Is euclidean geometry falsified? Sylvia Else <sylvia@not.at.this.address> - 2016-06-20 14:29 +1000
                Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-19 23:27 -0700
                Re: Is euclidean geometry falsified? The Starmaker <starmaker@ix.netcom.com> - 2016-06-20 11:08 -0700
        Re: Is euclidean geometry falsified? Y <yanarchi@hotmail.com> - 2016-06-20 01:53 -0700
          Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-20 02:17 -0700
        Re: Is euclidean geometry falsified? Rafael Valls Hidalgo-Gato <rvalls162@gmail.com> - 2016-06-20 08:39 -0700
          Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-20 11:31 -0700
            Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-20 20:51 +0200
              Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-20 12:13 -0700
                Re: Is euclidean geometry falsified? Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-20 21:44 +0200
                Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-20 15:46 -0700
                Re: Is euclidean geometry falsified? mlwozniak@wp.pl - 2016-06-20 23:10 -0700
                Re: Is euclidean geometry falsified? JanPB <filmart@gmail.com> - 2016-06-21 09:04 -0700

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