On 18 Nov 2008, at 15:03, A. Wolf wrote:

> 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.

i am not sure I understand. Are you thinking that the hero is in its  
own simulation?

We could imagine that the Theory of Everything is given by a  
Schroedinger-Dirac like equation applied to the quantum vacuum.
Then we can interpret the work of the hero as a dovetailing on the  
solutions of that equation. It would build a quantum multiverse. Yet,  
that cannot work.
And Telmo gave the reason. If we are machine (and we are machine if  
the hero's emulator can start), then physics is a sum on a continuum  
of computational histories, and nobody can write a program simulating  
that. Only a person, being generated almost everywhere omega times, in  
the deployment can "live" that, from inside. (for some others: omega  
is aleph_0, the continuum = 2^aleph_0).


> 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]>
> 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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