Re: Roberts' persusaive rhetoric.
From: Dirk Van de moortel (dirkvandemoortel_at_ThankS-NO-SperM.hotmail.com)
Date: 10/19/04
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Date: Tue, 19 Oct 2004 15:23:32 +0200
"sal" <pragmatist@nospam.org> wrote in message news:1098188826.rvmapfHxAXI0iDrV6yh5Pg@teranews...
> On Tue, 19 Oct 2004 05:31:17 +0000, Androcles wrote:
[snip]
> > I notice you didn't bother to provide the multiplicative or additive
> > inverses to the LTs that Roberts says have to exist.
>
> You're kidding, right? Any SR text has these -- even Martin Gardner must
> have shown them. Are you really asserting they don't exist?
>
> If frame S' is moving in the +X direction relative to frame S, at velocity
> v, and if g = 1/sqrt(1-v^2), and (0,0) -> (0',0'), and c=1, then
>
> t' = g * (t - vx)
> x' = g * (-vt + x)
>
> Inverse transform is
>
> t = g * (t' + vx')
> x = g * (vt' + x')
>
> Compose them and see what you get.
Hundreds of times this has been show to him (and to others).
He always goes berserk when he has to handle the square roots.
He can't decide whether they are positive or negative ;-)
Dirk Vdm
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