Somebody wrote:

> On the other hand if pronouns are avoided, so that referents are clear:
> "John is in Helsinki.  John is duplicated so duplicate Johns appear in
> Moscow and Washington.  Then John will be uncertain as to which city John
> will find himself in."


No so, in the above case the outcome is perfectly clear and predicable and
you just gave the answer yourself. "John is in Helsinki".

>Helsinki-John will be uncertain as to which city Moscow-John will find
> himself in.


Given that the very definition of  "Moscow-John" is the John that finds
himself in Moscow I think it may be safe to say that "Moscow-John" will be
in city of Moscow. But hey, don't blame me if this isn't very deep, it's
Bruno's thought experiment not mine.

> No amount of additional information will remove the subjective
> uncertainty of Helsinki-John about his future.


I can provide the needed information right now right here, the
Helsinki-John will see Helsinki the Moscow-John will see Moscow and the
Washington-John will see Washington. Anything else I can help you with?

  John K Clark




JKC says this is trivial since subjective uncertainty about the future is
commonplace.  But it's not trivial, anymore than Everett's MWI is trivial,
because without the duplication of subjects, subjective uncertainty about a
deterministic process could always be eliminated by gaining more
information.

JKC is just picking on the fact that Moscow-John could meet Washington-John
to say that this is different that Everett's MWI.



  But

 when an argument uses a thought experiment it is always the case that the
thought experiment is different from reality in some respect.



 In this case that difference is irrelevant to the inference from the
thought experiment, so there's no reason to object to it.  That's why it is
a mistake to reject and argument as soon as you find a "flaw" in one step.
It is necessary to see that the "flaw" is used in later steps before you
can reject the argument.



On Mon, Mar 23, 2015 at 12:36 AM, meekerdb <[email protected]> wrote:
>
> On 3/22/2015 8:55 PM, Kim Jones wrote:
>
> But Bruno is only explicating how there can be an objectively
determinsitic process that *necessarily* produces a subjectively uncertain
outcome.
>
>
>
> Yes. Clark has to accept the necessary nature of FPI to be in aosition to
go on. Understanding step 3 entails understanding that the FPI is purest
indeterminacy at the heart of a deterministic universe. He never will.
That's where he's scared. It's too much for him to suppose that some things
are truly random.
>
>
> But he does admit that; he even asserts it.  And he also says he thinks
MWI is right.
>
> Brent
>
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