This issue was canvassed under the name "no cul-de-sac conjecture" in
the list. Bruno claims to have proved this conjecture in his modal
world logic. I tried to do this using a more conventional formulation
of QM - it seemed to be related to unitarity of quantum processes -
but I have to say I haven't succeeded in this.

##
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An interesting point was made that black holes exhibit nonunitary
evolution, which has implications for those wishing an exit from
quantum immortality :)
Cheers
Pete Carlton wrote:
> If a large set of Eric-equivalents encounter a really dangerous
> situation, most will not continue, but as long as this assumption holds:
>
> "(The set of reasonably similar Eric-equivalents) contains
> (The set of Erics who are unnoticeably different from you) which
> contains
> (The set of Erics who have a living continuation after event X)
> which has at least one member."
>
> then you will not experience yourself dying. I think this is how
> materialism can accomodate QTI. I do think a better attack on QTI is
> that the final part of the above assumption (the last set has at least
> one member) isn't well-argued for. Even if these Eric-sets are
> infinite there may not be an Eric who survives, say, the sun exploding;
> just as the infinite set of composite numbers doesn't contain any
> primes.
>
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