On Sun, Jul 4, 2021, 6:54 PM 'Brent Meeker' via Everything List <
[email protected]> wrote:

>
> On 7/4/2021 5:17 AM, Tomas Pales wrote:
>
>
> On Sunday, July 4, 2021 at 1:51:51 PM UTC+2 Bruce wrote:
>
>>
>> And in the two-outcome experiment, how do you ever get a probability
>> different from 0.5 for each possible outcome?
>>
>> You would seem to be looking for a branch counting explanation of
>> probability (self-locating uncertainty). But there is no mechanism in
>> Everett or the Schrodinger equation to give anything other than a 50/50
>> split when only two outcomes are possible. This is wildly at variance with
>> experience.
>>
>
> In the classical example with balls you may have a collection of blue and
> red balls so there are only two possible outcomes of a random selection of
> a ball: blue and red. This doesn't mean that the proportion of blue and red
> balls in the collection must be 50/50. Why would the proportion of
> branching worlds necessarily be 50/50 if there are only two possible
> outcomes?
>
>
> It's not that it's necessarily 50/50; it's that there's no mechanism for
> it being the values in the Schroedinger equation. In one world A happens.
> In the other world B happens.  How does, for example, a 16:9 ratio get
> implemented.  There's nothing in Schroedinger's equation that assigns one
> of those numbers to one world or the other.  You can just make it an
> axiom.  Or equivalently, if you can show these are odds ratios, you can
> invoke Gleason's theorem as the only consistent probability measure.  But
> all that is extra stuff that MWI claims to avoid by just being pure
> Schroedinger equation evolution.
>
> Brent
>
> Is this question unique to MW?

Do Copenhagen/GRW/QBism/Transactional/Bohm have any advantage(s) in
explaining the Born rule?

I don't understand the problem that's unique to MW.

Jason

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