Re: A question of discrete space-time.

> Wouldn't it also have a *minimum* speed of one position per moment?
>
> Ralph Hartley

I like this idea. I believe the original poster's intent is that
we have a system in which 'information' moves, in one time unit,
either (i) nowhere, or (ii) to nearest neighbors. This means that
all speeds lie in [0,1].

To solve the 'velocity addition problem', I believe the
challenge for the original poster is to see if he can construct
a self-consistent, discrete, "special relativity", which solves
the velocity addition problem in the same way as Einstein or, perhaps,
in some novel way.

regards,
alan

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