On Thu, Feb 21, 2013 at 10:56 PM, meekerdb <meeke...@verizon.net> wrote:

>  On 2/21/2013 7:10 PM, Joseph Knight wrote:
>
> Question: Why is the "derivation"* of the Born Rule in (Everett, 1957) not
> considered satisfactory**?
>
>  *Everett shows that the amplitude-squared rule for subjective
> probability is the only measure consistent with an agreeable additivity
> condition.
>
>
> Gleason's theorem is to the same effect.  But both start with the
> assumption that the wave-function amplitude determines the probability -
> and then they show it must be via the Born rule.
>

OK, I see, thanks. I suppose then that the decision-theory derivation drops
this assumption?


> Brent
>
>
>  **It is apparently not satisfactory because there have been multiple
> later attempts to derive the Born Rule from certain other (e.g.,
> decision-theoretic) assumptions in an Everett framework (Deutsch, Wallace).
> I have not yet studied these later works so cannot yet comment on them (but
> would appreciate any remarks/opinions that Everything-listers have to
> offer).
>
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-- 
Joseph Knight

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