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 
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 
(Bruno's "yes doctor" choice). The other sticking point is, given 
is right, what does it take to implement a computation? There have been 
that a computation is implemented by any physical system (Putnam, Searle, 
and by no physical system (Maudlin, Bruno Marchal). The discussion about 
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. Comments and elaboration would be welcome.

Stathis Papaioannou
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