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.
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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