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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