On Wed, 29 Nov 2023 at 10:53, Bruce Kellett <bhkellet...@gmail.com> wrote:

> On Wed, Nov 29, 2023 at 10:40 AM Stathis Papaioannou <stath...@gmail.com>
> wrote:
>> On Wed, 29 Nov 2023 at 09:34, Bruce Kellett <bhkellet...@gmail.com>
>> wrote:
>>> On Wed, Nov 29, 2023 at 9:29 AM John Clark <johnkcl...@gmail.com> wrote:
>>>> On Tue, Nov 28, 2023 at 5:14 PM Bruce Kellett <bhkellet...@gmail.com>
>>>> wrote:
>>>> *> Given a long series of N spin measurements, MWI says that there is
>>>>> always one person who sees N spin-ups. Since this observation is certain,
>>>>> it has probability one. Whereas the Born probability of seeing N ups is
>>>>> 1/2^N. A clear contradiction.*
>>>>  The probability that Bruce Kellett will see N spin-ups is indeed one.
>>>> However the probability that you will see  N spin-ups is not. As I
>>>> mentioned before, for this sort of discussion the way the English language
>>>> handles personal pronouns needs to be modified.
>>> It is not a question of whether you will see the N spin-ups, or whether
>>> it is just one copy of Bruce Kellett that will see this. The
>>> incompatibility arises from the fact that the series of N spin-ups
>>> necessarily exits in MWI, where it only has probability 1/2^N from the Born
>>> rule.
>> If you lived in any sort of universe where you were duplicated, there
>> would be some probability that you would see different outcomes.
> So what? The problem you have is that you have changed the rules of the
> theory -- from a theory about what exists, to a theory about what you will
> see. Since you will only ever see one outcome, one world, you have reduced
> it from a theory of many worlds to a theory of a single world -- the world
> you will see!

Obviously the Born rule under MWI is about the probability of what outcome
you will see.

Stathis Papaioannou

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