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msumm21
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Take 2 people P1 and P2. P1 claims that a Stern-Gerlach device collapsed an electron’s spin to + or - (mixed state if P1 doesn’t know which) while P2 may say it did not collapse, but instead remains in a pure, entangled state. If we continue this sort of thinking (2 people applying different criteria for measurement) in a more complicated situation (maybe requiring interference), could P1 and P2 end up with “disjoint” probabilities for future outcomes. By disjoint here I mean the set of possible (non zero probability) outcomes are disjoint? I.e. the actual outcome will prove at least one of them “wrong.” Presumably this can’t happen, but has it been proven? Reference?