Re: SR time dilation on remote objects ?

From: Bjoern Feuerbacher (feuerbac_at_thphys.uni-heidelberg.de)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 16:27:37 +0200

Bjoern Feuerbacher wrote:
> Marcel Luttgens wrote:
>

[snip]

>> As at least Nu(o)S is wrong for light, Nu(o) is logically wrong,
>
>
> And exactly here, you make a huge jump in logic!!!
>
> From "a formula can be written as the ratio of two other formulas,
> which are *not* valid", it does *******NOT******* follow that the
> formula *itself* is not valid!!!!!!!!

Example: Let's say we talk about a container containing one liter of
water, obviously with a mass of 1 kg. The water in that container has
the density 1 kg/l.

So, now, the equations
   m = 2 kg
and
   V = 2 l
are *not* valid for the water in the container. Nevertheless, the
equation
   m/V = 1 kg/l,
which is just the *ratio* of the two equations above, *is* valid for the
water in the container.

Conclusion 1: the ratio of two formulas which are both *not* valid for a
certain situation *can* be valid in that situations.

Conclusion 2: your argument that because you can write the Doppler shift
formula for light as the ratio of two formulas which are only valid for
sound, but not for light, does not prove at all that the resulting
formula is also not valid for light.

Conclusion 3: you don't understand logic.

[snip]

Eagerly waiting for you completely missing the point, as usual,
Bjoern

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