Groups > sci.physics.relativity > #463510

Re: Fermat

Newsgroups	sci.physics.relativity
Date	2018-07-05 09:45 -0700
References	<783b2e39-27a5-42e0-ad7e-be01cfee7ee2@googlegroups.com> <vIKdncxt_JnhWKbGnZ2dnUU7_83NnZ2d@giganews.com> <fd2b2953-9156-4f62-9f63-c6f561e04ee6@googlegroups.com> <WMOdnVTtk6n626DGnZ2dnUU7_8zNnZ2d@giganews.com>
Message-ID	<0fd945ef-4e30-400a-b3e1-466dd84e252a@googlegroups.com> (permalink)
Subject	Re: Fermat
From	JanPB <filmart@gmail.com>

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On Wednesday, July 4, 2018 at 3:13:02 PM UTC-7, tjrob137 wrote:
> On 7/4/18 2:54 PM, alsor@interia.pl wrote:
> > In the GR the Fermat principle doesn't exist at all.
> 
> Sure it does, as long as one remembers to apply it in a locally inertial 
> frame, at each point along the null geodesic the light is following. If 
> there are optical media involved, Fermat's principle holds in the 
> geometrical-optics approximation.
> 
> Tom Roberts

I think Koobee is confused between 4D and 3D (he is trying to apply Fermat to the
former which yields nothing, of course, and then proceeds to declaring victory :-) ).

--
Jan

Thread

Fermat RichD <r_delaney2001@yahoo.com> - 2018-07-03 09:52 -0700
  Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-07-03 13:50 -0500
    Re: Fermat Oren Woodcock <uw@osiweoq.lp> - 2018-07-04 10:13 +0000
    Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-07-04 11:58 -0700
      Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-07-04 15:08 -0500
        Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-07-04 22:23 -0700
    Re: Fermat alsor@interia.pl - 2018-07-04 12:54 -0700
      Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-07-04 17:12 -0500
        Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-07-04 22:25 -0700
        Re: Fermat JanPB <filmart@gmail.com> - 2018-07-05 09:45 -0700
          Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-07-05 12:05 -0500
          Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-07-05 10:40 -0700
        Re: Fermat alsor@interia.pl - 2018-08-11 11:42 -0700
    Re: Fermat RichD <r_delaney2001@yahoo.com> - 2018-07-05 09:19 -0700
      Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-07-05 13:09 -0500
        Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-07-05 12:08 -0700
          Re: Fermat JanPB <filmart@gmail.com> - 2018-08-11 16:55 -0700
            Re: Fermat Owen Scharff <nehh@fenvhw.ho> - 2018-08-12 11:21 +0000
              Re: Fermat JanPB <filmart@gmail.com> - 2018-08-13 12:29 -0700
                Re: Fermat Lovu Biftek <ufeli@fupuks.cl> - 2018-08-13 21:35 +0000
                Re: Fermat JanPB <filmart@gmail.com> - 2018-08-13 14:44 -0700
            Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-08-12 11:36 -0700
              Re: Fermat JanPB <filmart@gmail.com> - 2018-08-13 12:31 -0700
                Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-08-13 16:26 -0700
            Re: Fermat alsor@interia.pl - 2018-08-13 09:08 -0700
              Re: Fermat JanPB <filmart@gmail.com> - 2018-08-13 12:33 -0700
                Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-08-13 16:36 -0700
                Re: Fermat JanPB <filmart@gmail.com> - 2018-08-13 19:18 -0700
                Re: Fermat Koobee Wublee <koobee.wublee@gmail.com> - 2018-08-13 22:11 -0700
                Re: Fermat Lovu Biftek <ufeli@fupuks.cl> - 2018-08-16 19:15 +0000
                Re: Fermat alsor@interia.pl - 2018-08-14 12:36 -0700
                Re: Fermat JanPB <filmart@gmail.com> - 2018-08-14 13:21 -0700
                Re: Fermat Lovu Biftek <ufeli@fupuks.cl> - 2018-08-14 20:26 +0000
                Re: Fermat alsor@interia.pl - 2018-08-16 09:29 -0700
                Re: Fermat alsor@interia.pl - 2018-08-16 09:25 -0700
                Re: Fermat Tom Roberts <tjroberts137@sbcglobal.net> - 2018-08-16 12:19 -0500
                Re: Fermat alsor@interia.pl - 2018-08-16 10:44 -0700

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