> On 28 Nov 2019, at 15:49, John Clark <[email protected]> wrote:
>
>
> On Thu, Nov 28, 2019 at 8:14 AM Bruno Marchal <[email protected]
> <mailto:[email protected]>> wrote:
>
> >> Then what one and only one city do "you" personally feel to be in?
>
> > In the third person view on the first person view, you can say [...]
>
> What about the first person view of the third person view of the first person
> view? And what about the third person view of the first person view of the
> third person view of the first person view? And what about….
Intuitively, that is rather simple, although a long nesting of such will be as
hard as a nesting of quantifiers in logic.
Technically you can treat this by working in the polymodal logic G, where you
can define [1]p by [0]p & p, with [0] being Gödel’s arithmetical predicate of
provability. The first person view of the third person view of the first person
view is given by [1][0][1]p, which becomes [0]{[0]([0]p & p) & ([0]p & p)} &
{[0]([0]p & p) & ([0]p & p)}.
>
> >> If you can not clearly answer that question,
>
> > The clear answer is the prediction I have made in Helsinki: with certainty,
> > I will [...]
>
> By casually throwing in the personal pronoun "I" in a thought experiment that
> contains a "I" duplicating machine you have already demonstrated you are
> unable to clearly answer the question.
You have claim this without ever saying what is unclear, except that you missed
the distinction in the question, which is strange because in other context you
show to understand it.
>
> > [...] feel to be in only one city, but I cannot predict which one among
> > Washington and Moscow.
>
> Forget prediction!! Even AFTER the experiment is long over you STILL can not
> answer the question "what city did you turn out to see?" and the reason you
> can't answer it is because it contains the personal pronoun "you"; and if
> personal pronoun duplicating machines are involved that means it is not a
> question at all, it's just gibberish with a question mark at the end.
>
> If you can't even clearly say what happened yesterday then you can't have had
> been expected to make a clear prediction on the day before yesterday about
> what would happen the next day.
See my previous answer, just sent some minutes ago.
Bruno
>
> John K Clark
>
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