[EMAIL PROTECTED] a écrit :
> 
> Georges Quenot wrote:
>> 
>> If you are a being that have never observed magical events
>> any duplicate of you "will" never have observed any magical
>> event either (otherwise you would differ and no longer be
>> true duplicates).
> 
> That doesn't work the other way round. A duplicate of me up to
> 16:51 GMT 20 mar 2006 could  suddenly start observing them.

Your duplicate will know. Not You. And he will no longer
be your duplicate.

>> A true duplicate of you will have had exactly the same
>> experiences (magical ones and all others) as you had.
>> It might be that your futures will differ but as long
>> as your are duplicates you will experience no difference
>> and as soon as you will have a different experience you
>> will no longer be true duplicates. You will never be
>> aware that your previously counterpart has had a
>> different experience and is no longer your counterpart
> 
> Why not ? I can remember my past selves' experiences, although
> they are more different to my present self than some of my other-world
> counterparts. You might point out that I can only remember because my
> present self has memory-traces that were laid down by my past selves.

Considering how physics run in this universe, yes.

> But that is to assume that causality works in the common-sense
> way, from past to future, and not across worlds.  But if every
> mathematical structure is equally real, that constraint should not
> exist globally.

It should not exist in all worlds. It could exist in some.
Contingency again.

>>> and overlays of normal universes and
>>> magical universes are instantiated as well.
>> *As well*. But it might be that you are just in one which
>> *is not* overlayed (that's contingency).
> 
> Yes, but how likely is that ?

Very good question. This is right here that the difference
of viewpoint makes all the difference.

> Many-world theories always
> come down to an appeal to coincidence.

Indeed. That is contingency.

> If every world is instantiated, there will be worlds where everyone
> becomes a sorcerer at the stroke of midnight.

Yes, and we will all know when it will happen. Be patient.

Georges.

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