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On 2016, Apr 13, , at 14:17, John Denker <jsd@av8n.com> wrote:
On 04/12/2016 07:37 PM, Ludwik Kowalski wrote:
According to:
http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html <http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html>
That's an article by Steve Carlip, hosted on John Baez's excellent
site: http://math.ucr.edu/home/baez/ <http://math.ucr.edu/home/baez/>
The physics FAQ is at: http://math.ucr.edu/home/baez/physics/ <http://math.ucr.edu/home/baez/physics/>