Groups > sci.physics.relativity > #359513

Re: Inescapable (symmetric) twins paradox

From	Bohuš Matuška <bohu@paranetnet.net>
Newsgroups	sci.physics.relativity
Subject	Re: Inescapable (symmetric) twins paradox
Date	2015-08-03 15:11 +0000
Organization	Service Informatique SI Inc
Message-ID	<mpo0ar$bq2$1@speranza.aioe.org> (permalink)
References	(13 earlier) <a0504b4f-d255-4a6f-a127-ffe85a212a3f@googlegroups.com> <mpj48q$uhs$1@speranza.aioe.org> <1b328075-8cdc-434e-ad5f-b012ecb2bbbd@googlegroups.com> <mpksr1$gbl$1@speranza.aioe.org> <967ae166-18d7-4408-999c-fa91b06b7f9f@googlegroups.com>

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JanPB wrote:

> On Sunday, August 2, 2015 at 3:53:25 AM UTC-7, wobbly wrote:
>> JanPB wrote:
>> 
>> > On Saturday, August 1, 2015 at 11:48:00 AM UTC-7, wobbly wrote:
>> >> JanPB wrote:
>> >> 
>> >> > This is very basic, it simply follows from the general formula for
>> >> > arc length which is sqrt(g_ij qdot^i qdot^j) dt when the
>> >> > coordinates ARE standard inertial, i.e. g = -c^2 dt^2 + dx^2 +
>> >> > dy^2 + dz^2
>> >> 
>> >> Is this the same as
>> >> 
>> >>     g = [-(cdt)², (dx)², (dy)², (dz)²]
>> > 
>> > I don't know what you wrote on the right-hand side. It's not correct
>> > mathematics,
>> > so if it's some private notation that you use, explain it first.
>> 
>> Are you serious, not familiar with vector notation of the same?
>> https://en.wikipedia.org/wiki/Vector_notation
> 
> What you wrote above is not a vector, it's just a (meaningless)
> string of symbols connected by commas and enclosed in parentheses.

Hmm, you make me think you must a bachelor only mathematician. LOL, come 
on, I wonder you understand anything in those papers you pretend to review.

https://en.wikipedia.org/wiki/Four-vector

Take a look at the first expression. No wonder Koobee is likely stronger 
than you in tensors.

> Do you know, for example, what "dx" really _is_? How about "dx^2"?

It must be as it says, an arbitrary infinitesimal change along the X 
direction/axis. In Math Modelling and scientific computation that would be 
the projection of the evolution/time step along that axis (resolution).

Don't you really know this stuff?

>> >> Why don't you say so. What is g anyway, arc length? On which circle?
>> > 
>> > Not on circle (what an idea!). g is the Minkowski metric coefficients
>> > given with respect to some noninertial coordinates (like those of the
>> > travelling twin).
>> 
>> I don't understand a word of what you say. That must be a STERADIAN,
>> not an arc.
> 
> OK, I'm done talking to you. You have a _massive_ amount of catching up
> to do, as I said many times before, I cannot post a manifold theory
> course here.

Yeah, who asked you about that manifold theory. Was about s simple 
question involving representation. There must be a reason calling it an 
Arc. Such thing requires a circle, you MUST agree in that.

Thread

Re: Inescapable (symmetric) twins paradox "Julio Di Egidio" <julio@diegidio.name> - 2015-07-23 14:49 +0100
  Re: Inescapable (symmetric) twins paradox "Dono," <sa_ge@comcast.net> - 2015-07-23 06:54 -0700
  Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-23 07:24 -0700
    Stephane Baune puffs himself up "Dono," <sa_ge@comcast.net> - 2015-07-23 07:31 -0700
      Re: Stephane Baune puffs himself up "Dono," <sa_ge@comcast.net> - 2015-07-23 10:35 -0700
      Re: Stephane Baune puffs himself up and proves himself  a severely delusional POS "Dono," <sa_ge@comcast.net> - 2015-07-23 11:12 -0700
  Re: Inescapable (symmetric) twins paradox Sylvia Else <sylvia@not.at.this.address> - 2015-07-24 11:44 +1000
  Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-07-23 22:00 -0500
    Re: Inescapable (symmetric) twins paradox paparios <paparios@gmail.com> - 2015-07-24 04:50 -0700
    Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-07-25 08:34 -0700
      Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-25 09:06 -0700
    Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-25 09:04 -0700
      Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-07-27 16:40 -0500
      Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-27 14:42 -0700
        Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-27 14:58 -0700
          Re: Inescapable (symmetric) twins paradox rotchm <rotchm@gmail.com> - 2015-07-27 16:25 -0700
          Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-28 14:08 -0700
      Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 19:26 +0000
        Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-29 12:47 -0700
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 20:08 +0000
            Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-07-29 13:42 -0700
        Re: Inescapable (symmetric) twins paradox "Dono," <sa_ge@comcast.net> - 2015-07-29 12:59 -0700
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-07-29 20:10 +0000
      Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-01 22:21 -0700
        Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-08-02 10:53 +0000
          Re: Inescapable (symmetric) twins paradox wobbly <wobbly@dont-email.me> - 2015-08-02 11:00 +0000
          Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-02 21:07 -0700
            Re: Inescapable (symmetric) twins paradox Bohuš Matuška <bohu@paranetnet.net> - 2015-08-03 15:11 +0000
          Re: Inescapable (symmetric) twins paradox Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-08-09 22:24 +0200
            Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-09 17:59 -0700
              Re: Inescapable (symmetric) twins paradox Felipe Delgado <fd@spreadspectrum.org> - 2015-08-10 18:24 +0000
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-10 11:33 -0700
                Re: Inescapable (symmetric) twins paradox Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-08-19 22:16 +0200
                Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-08-19 18:43 -0500
                Re: Inescapable (symmetric) twins paradox Odd Bodkin <bodkinodd@gmail.com> - 2015-08-24 09:52 -0500
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-25 00:01 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-25 00:05 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-25 00:29 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-25 11:16 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-25 22:36 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-25 23:06 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-26 00:19 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-26 10:54 -0700
                Re: Inescapable (symmetric) twins paradox Maciej Woźniak <mlwozniak@wp.pl> - 2015-08-26 20:32 +0200
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-26 15:58 -0700
                Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-08-27 11:44 -0500
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-08-27 15:24 -0700
                Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-08-27 22:15 -0500
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-27 23:49 -0700
                Re: Inescapable (symmetric) twins paradox Odd Bodkin <bodkinodd@gmail.com> - 2015-08-28 07:19 -0500
                Re: Inescapable (symmetric) twins paradox Tom Roberts <tjroberts137@sbcglobal.net> - 2015-08-28 09:55 -0500
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-28 16:52 -0700
                Re: Inescapable (symmetric) twins paradox kefischer <emoneyjoe@iglou.com> - 2015-08-28 20:49 -0400
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-28 21:45 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-07 11:13 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-07 12:21 -0700
                Re: Inescapable (symmetric) twins paradox "Lleyton H. Bellucci" <lleyb@stratospheree.org> - 2015-09-07 19:36 +0000
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-07 12:38 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-07 15:49 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-09-07 20:45 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 02:15 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-09-08 10:10 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 11:35 -0700
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-09-08 12:46 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 13:15 -0700
                Re: Inescapable (symmetric) twins paradox Maciej Woźniak <mlwozniak@wp.pl> - 2015-09-08 22:47 +0200
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 15:09 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 15:11 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-08 10:17 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 11:25 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-08 13:18 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 13:30 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-08 15:34 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-09-08 18:22 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-09 10:25 -0700
                Re: Inescapable (symmetric) twins paradox paparios <paparios@gmail.com> - 2015-09-09 10:54 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-09-09 12:40 -0700
                Re: Inescapable (symmetric) twins paradox JanPB <filmart@gmail.com> - 2015-08-20 22:24 -0700
                Re: Inescapable (symmetric) twins paradox kefischer <emoneyjoe@iglou.com> - 2015-08-21 02:44 -0400
                Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-08-20 23:58 -0700
                Re: Inescapable (symmetric) twins paradox alsor@interia.pl - 2015-08-21 08:14 -0700
              Re: Inescapable (symmetric) twins paradox Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-08-19 22:10 +0200
            Re: Inescapable (symmetric) twins paradox Felipe Delgado <fd@spreadspectrum.org> - 2015-08-11 18:19 +0000
    Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-07-25 22:57 -0700
    Re: Inescapable (symmetric) twins paradox Koobee Wublee <koobee.wublee@gmail.com> - 2015-07-25 22:57 -0700
      Re: Inescapable (symmetric) twins paradox Odd Bodkin <bodkinodd@gmail.com> - 2015-07-27 09:49 -0500

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