Re: MWI and Born's rule / Bruce

```On Friday, February 14, 2020 at 3:34:59 AM UTC-6, Bruce wrote:
>
> On Fri, Feb 14, 2020 at 7:56 PM Alan Grayson <agrays...@gmail.com
> <javascript:>> wrote:
>
>> On Thursday, February 13, 2020 at 4:33:52 PM UTC-7, Brent wrote:
>>>
>>> On 2/13/2020 1:17 PM, Alan Grayson wrote:
>>>
>>> Bruce argues that the MWI and Born's rule are incompatible. I don't
>>> understand his argument, no doubt my failing.
>>>
>>>
>>> I don't think they are incompatible; it's just that the Born rule has to
>>> stuck in somehow.  It's not implicit in the SWE and can't be derived from
>>> the linear evolution.  Somehow a probability has to be introduced.  Once
>>> there is a probability measure, then it can be argued via Gleason's theorem
>>> that the only consistent measure is the Born rule.
>>>
>>> Brent
>>>
>>
>> I think what Bruce is trying to show, is that using the MWI, one CANNOT
>> derive Born's rule as claimed by its advocates. But whether one affirms MWI
>> or not, the only thing one has to work with is an ensemble generated by
>> measurements in THIS world. So if you cannot derive Born's rule using a
>> one-world theory, it would seem impossible to do so with many-worlds, since
>> in operational terms -- what is observed -- the two interpretations are
>> indistinguishable.  AG
>>
>
> That's quite an astute observation, Alan. The thing is, we can move on
> from there. If Many-worlds is true, all possible sets of measurements are
> generated, and most will give different values for the probabilities. For
> the observers getting the alternative data, there is nothing to tell them
> that they are getting the wrong answer. MWI is incoherent.
>
> Bruce
>```
```
All quantum interpretations have a level of incoherence.

LC

> ISTM that whether we affirm one world or many worlds, all we can ever
>>> measure is what observe in this world, and it is from this world that we
>>> generate an ensemble after many trials from which to observe and affirm
>>> Born's rule. What am I missing, if anything? TIA, AG
>>>
>>>

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