Even if you could discretize the universe to a countable submodel (and I'm 
not certain you can), each step of the computation would take forever (each 
step is ordered by omega the way the stones are laid out).  An infinite 
amount of time bounded by discrete steps isn't enough time to complete more 
than one step, based on the way the description is given.

So that's one error.  You could correct it by changing the order in which 
the stones are laid out, but it will still only work for universes in which 
space and time are quantized in a mathematically problematic way.

Anna


----- Original Message ----- 
From: "Bruno Marchal" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, November 18, 2008 6:23 AM
Subject: Little exercise


> Hi,
>
> A joke could hardly been wrong, yet, if taken seriously enough, a joke
> could be made more correct! (and probably less funny, but that's not
> the point).
>
> How would you make "correct" the joke here:
>
> http://xkcd.com/505/
>
> Hint: step 7
>
> This question is addressed mainly to Jason and Kory, who, it seems to
> me,  have still a little problem with step 7, if I may say,
>
> Bruno
>
> http://iridia.ulb.ac.be/~marchal/
>
> >
> 


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