Quentin Anciaux wrote:
2015-05-04 9:26 GMT+02:00 Bruce Kellett <bhkell...@optusnet.com.au <mailto:bhkell...@optusnet.com.au>>:Stathis Papaioannou wrote: On 4 May 2015 at 17:14, Bruce Kellett <bhkell...@optusnet.com.au <mailto:bhkell...@optusnet.com.au>> wrote: The initial point that we were making was that copying at the quantum level of substitution is not possible, in principle. Accidental copies in another universe are not "deliberate but surreptitious" copies. They are irrelevant to the argument. You implied that if you did not know about the copy because it was not prepared deliberately that would make a difference, but I don't see why it should. The point of Step 3, as I understand it, is that we know the set-up: we know that we are to be copied at the appropriate substitution level and duplicated -- at two different locations. Chance duplicates do not fit the criteria and are irrelevant to the comp hypothesis.It's a though experiment... so the duplicates do fit the criteria by definition.. you even gave it here "we are to be copied at the appropriate substitution level and duplicated"... step 0 again, is that it is possible... so, if you reject step 0, there is no point to use that as an argument against further steps... you already have rejected the premiss, so any deductive steps based on it have already been rejected by you as you reject step 0.
The point being made is that deliberate copying at the quantum level is impossible in principle. That is what is required for "yes doctor" at step 0, so the whole argument collapses if the substitution level has to be that low. The argument only has a chance of going through is that if the appropriate substitution level is classical, and capable of accurate digital simulation. Anything else and comp fails to get off the ground.
Now I am not saying that quantum level substitution is necessary, just that *if it is', the argument fails.
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