On 04 Mar 2009, at 07:13, Stathis Papaioannou wrote:

> 2009/3/4 Günther Greindl <guenther.grei...@gmail.com>:
>> Imagine the sequence:
>> Scan - Annihilate - Signal - Reconstitute
>> Now consider that the Signal travels for 100 000 lightyears
>> before it hits the reconstitution chamber (just to
>> have a big distance, the concern is causal disconnection in  
>> spacetime).
>> Now, in the meantime, the reconstitution chamber has been overtaken  
>> by
>> aliens (coming from the other side of the galaxy) who have advanced
>> technology and can control the multiverse - they decide the tweak the
>> multiverse that the reconstitution happens in _no_ multiverse at  
>> all (by
>> destroying all chambers).
>> This would suggest that the no cul de sac conjecture implies that
>> annihilation in the above sequence fails.
>> But surely this can not depend on the decision of the aliens, who  
>> were
>> nowhere near the causal lightcone of the annihilation event.
>> This would imply one of three things (in my view in decreasing  
>> degree of
>> plausibility):
>> .) no cul-de-sac is false; no QI, even in RSSA scenarios.
>> .) annihilation always fails. That is, if a copying machine exists,
>> there will always be a version of you which feels that copying has  
>> not
>> succeeded and "nothing happened" (even if you said you wanted to be
>> annihilated after the duplication).
>> .) COMP obeys global super-selection rules, akin to pre-determinism;
>> that is, in scenarios where aliens destroy the chambers, annihilation
>> fails, else not. Analogously for other scenarios.
> The no-cul-de-sac hypothesis is false if you allow that there is some
> means of destroying all copies in the multiverse. But there is
> probably no such means, no matter how advanced the aliens.

Indeed, that would be like if a number could make disappear another  
number. Even a God cannot do that!



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