On Sun, Jun 22, 2014 at 7:15 AM, LizR <[email protected]> wrote:

>>  the probability that Mr. He will see Moscow is 1.0 not 0.5 as Bruno
>> says.
>>
>
> > I agree,
>

Good.

> but
>

But? There is no "but", Bruno predicted 0.5, we observe 1.0, game over.

> I don't see that it invalidates his argument. In practice Mr H and the
> quantum physicist both assign probabilities retroactively,
>

Since they both involve probabilities the 2 experiments must  be repeated
many times to test the underlying theoretical predictions, the 2 slit
experiment to test the MWI and Bruno's thought experiment to test his
Universal Dance Association theory. When you repeat the 2 slit experiment
you find that sometimes the electron went through slit X and sometimes it
did not, but no matter how often you repeat Bruno's thought experiment you
ALWAYS find that Mr. You (or Mrs. You) sees Moscow. The results of these
experiments tell us that the MWI might be true but Bruno's Universal Dance
Association theory is definitely wrong because it made the wrong
prediction.


> > I know that the MWI says I will do all sorts of bizarre things in the
> next second
>

And Mrs. I will indeed do all sorts of bizarre things in the next second.

> including spontaneously being teleported to Helsinki
>

True, although Mrs I also never saw Helsinki and was instead spontaneously
being teleported to Moscow. This would be a very odd situation but it is
NOT a logical paradox because Mrs. I HAS BEEN DUPLICATED.

> but I act just as though I only have one future.
>

Acting as if you have only one future is not the same as having only one
future, that's why the MWI isn't intuitively obvious to everybody.

> The probability assignment question is only a psychological matter
>

Until about 90 years ago physicists would say that all probability is just
a psychological matter, it's just a measure of our ignorance; then they
said probability is inherent to the thing itself, but if the MWI turns out
to be true then probability goes back to being subjective.

> Bruno is only using it to illustrate that duplication gives the effect of
> apparent indeterminacy, just as it does in the MWI.
>

No, Bruno has said over and over that he has found some new sort
of indeterminacy that is fundamentally different from Turing style
indeterminacy or
Heisenberg style indeterminacy, I say it's just the same old indeterminacy.

  John K Clark

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