Re: Question about light clock and derivation of time dilation

[EL]
I do not want to lose you over mathematical jargon.
Points in an affine space can be associated with a vector, but this is
not the issue.
Just answer me this question: Is there any physical sense in a negative
frequency?
You are at noon today, if yesterday is a negative time interval and
tomorrow is a positive time interval relatively, then what is the sign
of today's time interval at your temporal position?

EL


YBM wrote:
> Androcles a écrit :
> >>So there is or there is not a "yesterday" ?
> >
> > There used to be one, but it is over.
>
> So the word "yesterday" as a meaning, as well as
> the expression "yesterday, at noon on Princes street",
> as well as the space-time location (1,0,3,-1).
>
> >>How could you confuse the trivial fact of
> >>talking about events taking place before
> >>an arbitrary origin of a clock and traveling
> >>to the past ?
> >
> > How can you confuse an event in the past with a vector?
>
> Technically speaking, space-time can be represented by
> an affine space, not a vectorial one :
>
> http://mathworld.wolfram.com/AffineSpace.html
>
> Anyway it doesn't matter much, since by choosing a
> convenient origin this space is isomorphic to a
> vectorial one.
>
> > It is even worse than confusing
> >
> >>closing velocity and relative velocity (what you
> >>do for years).
> >
> > What's the difference,
>
> You should know.

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