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pragmatist comments on Rationality Quotes July 2014 - LessWrong
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Observers are treated as explanatorily fundamental, sure, just as they are in any anthropic-type explanation. But I don't see why that's a problem. The issue is when observers are treated as ontologically fundamental, as they are in some objective collapse interpretations, because that conflicts with the apparent fact that observers are entirely made up out of quantum-mechanical parts. Carroll's paper faces no such conflict.
What pragmatist said.
Basically the approach of Sebens and Carroll is to show that if observers are present, then they will see outcomes following the Born rule.
In that sense it seems that observers here are no more problematic than the observers of special relativity, where there are claims like if you use clocks to measure time in a moving frame, then you will see time slowing down relative to mine.