# Re: The multiverse is unscientific nonsense??

```On Wed, Nov 29, 2023 at 11:13 AM Stathis Papaioannou <stath...@gmail.com>
wrote:```
```
> 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.
>

As I pointed out, if it is a theory about what you will see, then it is a
single world theory, since you will only ever see just one world. Hence the
incompatibility with Many worlds, which is a theory about what exists.

Bruce

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