humpolec comments on A note on the description complexity of physical theories - Less Wrong
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That's the problem - it shouldn't really convince him. If he shares all the data and priors with external observers, his posterior probability of MWI being true should end up the same as theirs.
It's not very different from surviving thousand classical Russian roulettes in a row.
ETA: If the chance of survival is p, then in both cases P(I survive) = p, P(I survive | I'm there to observe it) = 1. I think you should use the second one in appraising the MWI...
ETA2: Ok maybe not.
Related (somewhat): The Hero With A Thousand Chances.