Re: FTL, ether and wind

On 15 veebr, 22:23, Gene Ward Smith <g...@[EMAIL PROTECTED]
> wrote:
> Crown-Horned Snorkack <chornedsnork...@[EMAIL PROTECTED]
> wrote in
> news:d0adcd0e-143e-4e8d-a33a-47c205f1e0b7
> @[EMAIL PROTECTED]
>
>
>
> > If you can send a ship or a message from point A to point B and back
in zero roundtrip time, you can compare the
> > real simultaneity of events as established by FTL with the outcome of
lightspeed signals sent through ordinary space. > > This would enable
observation of ether wind - inertial frames would no longer be equivalent.
Only in FTL, though - all
> > predictions of relativity as to STL effects would still hold.
>
> You are saying if you assume there is a preferred frame, you can
conclude there is a preferred frame.

If the roundtrip time between A and B by FTL is exactly zero, and
signals sent A to B at FTL and back B to A arrive after a finite time,
how do you avoid a preferred frame?