On 17 Jun 2015, at 18:14, John Clark wrote:
On Wed, Jun 17, 2015 Bruno Marchal <[email protected]> wrote:
>> We're talking about multiple (probably infinite) copying and
branching, so who the hell is "you"?
> All of them are you,
I agree, and so the conclusion is logically inescapable, "you" will
see Moscow AND Washington.
In the 3-1 view. An external (to the teleportation device) observer
can see that.
But, of course, it is obvious that after the duplication, each
reconstitution will feel to be only one of the reconstitutions, as
each of them cannot feel to see both W and M simultaneously, and so
BOTH will agree that it looks like a collapse from "Moscow and
Washington" to either Moscow or Washington.
> but all of them will feel to be only one of them
Yes, but given the definition of the personal pronoun "you" given
above that we both agree on, that in no way changes the fact that
"you" will see Moscow AND Washington. How a logician could deny that
mystifies me.
I have never deny that, as this is the correct 3-1 view. But it is as
simple as as possible that all the correct 1-views, after the
duplication, will involve only seeing one city, and thus will feel
like if a collapse occurred, when in this classical case we know that
none occurs, by construction.
> from the 1p perspective
There is no such thing as "the 1p perspective", there is only "a 1p
perspective;
Not at all. After the duplication there are two; logically
incompatible, 1p perspectives. "I see only W" and "I see only M".
there is no one true perspective, one is as legitimate as another.
Exactly, that is why we have to take all of them into account, and
that is why we get that First Person Indeterminacy. If in Helsinki you
predict "I will see both W and M", BOTH reconstituted persons will
have to write "I was wrong: I definitely see only one city".
Bruno
John K Clark
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