Mark Peaty writes:

SP: 'Getting back to the original question about teleportation experiments, are 
you saying that it would be impossible, or just technically very difficult to 
preserve personal identity whilst undergoing such a process? As Brent pointed 
out, technical difficulty is not an issue in thought experiments. ,
MP: I have answered this, in responding to Brent. In summary I say: if it is 
just A [any old] rendition of a human you want, then given that thought 
experiments allow that all practical challenges can be overcome, the answer is 
Yes!  On the other hand if the strict requirement of an exact copy of a 
particular person is required to be output then it becomes a question of 
whether or not truly infinite computing power is required to calculate the 
changes occurring within the original at scan time. If it is then the answer is 
NO, because infinity is infinity.
I think Derek Parfit's copier [Reasons and Persons Ch 10] was 'usually' 
producing complete and accurate copies, because one of his scenarios addresses 
what would happen if there was a fault in the transmission.

The brain manages to maintain identity from moment to moment without perfect 
copying or infinite computing power. Of course, you may need very good copying 
and very great computing power, but this is different in kind, not just in 
degree, from perfect copying and infinite computing power.

Stathis Papaioannou
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