Le 21-août-06, à 07:11, Stathis Papaioannou a écrit :

> It seems to me that there are two main sticking points in the 
> discussions on
> several list threads in recent weeks. One is computationalism: is it 
> right or wrong?
> This at least is straightforward in that it comes down to a question 
> of faith, in the
> final analysis, as to whether you would accept a digital replacement 
> brain or not
> (Bruno's "yes doctor" choice).

Yes. Unfortunately this gives not a purely operational definition of 
Someone could say yes to the doctor, just thinking that God exists, and 
that God is infinitely Good so that he will manage to resuscitate him 
through the reconstitution (he believes also God is infinitely 
So comp is really the belief that you can survive with an artificial 
brain *qua computatio", that is, through the respect of some digital 
relation only.

> The other sticking point is, given computationalism
> is right, what does it take to implement a computation? There have 
> been arguments
> that a computation is implemented by any physical system (Putnam, 
> Searle, Moravec)
> and by no physical system (Maudlin, Bruno Marchal).

OK. To be sure Maudlin would only partially agree. Maudlin shows (like 
me) that we have:


But apparently Maudlin want to keep physical supervenience, and thus 
concludes there is a problem with comp. I keep comp, and thus I 
conclude there is a problem with physical supervenience.
Actually I just abandon the thesis of the physical supervenience, to 
replace it by a thesis of number-theoretical supervenience.

> The discussion about Platonism
> and the ontological status of mathematical structures, in particular, 
> relates to this
> second issue. Bruno alludes to it in several papers and posts, and 
> also alludes to his
> "movie graph argument", but as far as I can tell that argument in its 
> entirety is only
> available in French.

That's true. I should do something about that. I don't feel it is so 
urgent in the list because there are more simple problem to tackle 
before, and also, most "MWI", or "Everything"-people can easily imagine 
the UD doesn't need to be run. But this is a subtle problem for those 
who have faith in their uniqueness or in the uniqueness of the world. 
Still you are right, I should write an english version of the movie 



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