Groups > sci.physics.relativity > #386247

Re: Actually Einstein's Relativity Predicts No Time Travel

From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: Actually Einstein's Relativity Predicts No Time Travel
Date	2016-06-20 00:19 +0200
Organization	PointedEars Software (PES)
Message-ID	<5181909.lOV4Wx5bFT@PointedEars.de> (permalink)
References	(6 earlier) <ea1d3917-3fc6-4647-972b-f734c25a3575@googlegroups.com> <184cac62-93c5-42e4-b058-46b50da2948f@googlegroups.com> <OpCdneoUuIs1QvjKnZ2dnUU7_8xj4p2d@giganews.com> <c06891f8-4593-45d8-81d3-050477f15ada@googlegroups.com> <07idnYtfS4T1TvvKnZ2dnUU7_83NnZ2d@giganews.com>

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Tom Roberts wrote:

> On 6/19/16 6/19/16   7:15 AM, Gary Harnagel wrote:
>> On Saturday, June 18, 2016 at 5:56:30 PM UTC-6, tjrob137 wrote:
>>> On 6/17/16 6/17/16   6:15 PM, Gary Harnagel wrote:
>>>> However, given mathematical incompleteness theorems, maybe mathematics
>>>> isn't so certain after all?
>>> No. Theorems properly derived are indeed certain, given the axioms from
>>> which they were derived.
>>>
>>> incomplete != uncertain
>>
>> But how do we know that the axioms are "correct"?
> 
> In mathematics, the question NEVER COMES UP. The axioms are given, and the
> theorems follow from them.  It is COMPLETELY IRRELEVANT whether the
> concepts embodied in the axioms are related to anything (including the
> world we inhabit).

Correct.  It should be added that it is the very *nature* of axioms that 
they are accepted as a given, for that is their definition:

,-<https://en.wiktionary.org/wiki/axiom>
| 
| […]
| Etymology
| 
| From Middle French axiome, from Ancient Greek ἀξίωμα ‎(axíōma, “that which 
| is thought to fit, a requisite, that which a pupil is required to know 
| beforehand, a self-evident principle”), from ἀξιόω ‎(axióō, “to think fit 
| or worthy, require, demand”), from ἄξιος ‎(áxios, “worthy, fit”, literally 
| “weighing as much as, of like value”), from ἄγω ‎(ágō, “I drive”).

It is (only) important that the conclusions drawn from axioms are valid 
ones, IOW that they are not fallacies.

-- 
PointedEars

Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

Thread

Actually Einstein's Relativity Predicts No Time Travel Pentcho Valev <pvalev@yahoo.com> - 2016-06-14 23:43 -0700
  Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-15 05:53 -0700
    Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-15 06:35 -0700
      Re: Actually Einstein's Relativity Predicts No Time Travel Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-06-15 19:59 +0200
        Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-15 23:01 -0700
      Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-15 14:11 -0700
    Re: Actually Einstein's Relativity Predicts No Time Travel kenseto <setoken@att.net> - 2016-06-16 08:30 -0700
      Re: Actually Einstein's Relativity Predicts No Time Travel Odd Bodkin <bodkinodd@gmail.com> - 2016-06-20 12:18 -0500
        Re: Actually Einstein's Relativity Predicts No Time Travel kenseto <setoken@att.net> - 2016-06-21 07:55 -0700
          Re: Actually Einstein's Relativity Predicts No Time Travel Odd Bodkin <bodkinodd@gmail.com> - 2016-06-21 10:10 -0500
            Re: Actually Einstein's Relativity Predicts No Time Travel kenseto <setoken@att.net> - 2016-06-22 06:16 -0700
              Re: Actually Einstein's Relativity Predicts No Time Travel Odd Bodkin <bodkinodd@gmail.com> - 2016-06-22 08:25 -0500
  Re: Actually Einstein's Relativity Predicts No Time Travel Pentcho Valev <pvalev@yahoo.com> - 2016-06-15 06:48 -0700
    Re: Actually Einstein's Relativity Predicts No Time Travel Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-06-15 20:40 +0200
    Re: Actually Einstein's Relativity Predicts No Time Travel Pentcho Valev <pvalev@yahoo.com> - 2016-06-16 04:55 -0700
      Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-16 05:09 -0700
        Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-16 15:38 -0700
          Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-16 19:13 -0700
            Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-17 15:51 -0700
      Re: Actually Einstein's Relativity Predicts No Time Travel Pentcho Valev <pvalev@yahoo.com> - 2016-06-17 02:43 -0700
        Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 04:42 -0700
          Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-17 05:02 -0700
            Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 06:47 -0700
              Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-17 06:53 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 07:27 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-17 17:40 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 10:47 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-17 19:58 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 15:27 -0700
            Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-17 16:06 -0700
              Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 16:15 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Tom Roberts <tjroberts137@sbcglobal.net> - 2016-06-18 18:56 -0500
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-19 05:15 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Tom Roberts <tjroberts137@sbcglobal.net> - 2016-06-19 12:16 -0500
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-19 11:18 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel RichD <r_delaney2001@yahoo.com> - 2016-06-21 12:12 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-21 13:50 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-22 06:59 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-22 12:44 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-22 21:47 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-22 16:58 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-19 20:37 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-06-20 00:19 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-19 20:30 +0200
              Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-17 16:17 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-20 20:29 -0700
              Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 21:29 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-18 13:25 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-18 22:46 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-18 15:04 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Maciej Woźniak <mlwozniak@wp.pl> - 2016-06-19 06:26 +0200
                Re: Actually Einstein's Relativity Predicts No Time Travel JanPB <filmart@gmail.com> - 2016-06-20 20:39 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel mlwozniak@wp.pl - 2016-06-20 23:12 -0700
                Re: Actually Einstein's Relativity Predicts No Time Travel Gary Harnagel <hitlong@yahoo.com> - 2016-06-21 08:00 -0700

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