Peter Jones writes:

> Stathis Papaioannou wrote:
> > If every computation is implemented everywhere anyway, this is equivalent 
> > to the situation where every
> > computation exists as a platonic object, or every computation exists 
> > implemented on some computer or
> > brain in a material multiverse.
> But if implementing a particular computation depends on an observer, or
> a dicitonary,
> or somesuch, it is not the case that everything implements every
> computation unless
> it can be shown that evey dictionary somehow exists as well.

The computation provides its own observer if it is conscious, by definition. If 
it isn't conscious then it's a matter 
of taste whether you say it is implemented, but trivially or uselessly, in the 
absence of an observer, or it isn't 
implemented at all in the absence of an observer. Conscious computations are 
the interesting case - if indeed 
computations can be conscious.

> > The dynamism part can be provided by a simple physical system such as the 
> > idle passage of time.
> > If you allow for parallel processing you don't need much time either. This 
> > leads to a situation whereby
> > every computation is implemented by universe with a single electron
> What is parallel about a single electron ?

If a physical system passing through a series of states in a given time 
interval can implement more than one 
computation, then it can be seen as implementing more than one computation 
simultaneously during the 
given interval. In this way, the number of computational states the system can 
implement can exceed the 
number of possible physical states (of course, if the MWI is true, you don't 
need this trick as there are always 
plenty of distinct physical states in even a very limited physical system).

Stathis Papaioannou
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