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PhilGoetz comments on A note on the description complexity of physical theories - Less Wrong
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Comments (177)
Flip a quantum coin.
Isn't that like saying "Under MWI, the observation that the coin came up heads, and the observation that it came up tails, both have probability of 1"?
The observation that I survive 1000 good suicide attempts has a probability of 1, but only if I condition on my being capable of making any observation at all (i.e. alive). In which case it's the same under Copenhagen.
I have no theories about what you're thinking when you say that.
Either you condition the observation (of surviving 1000 attempts) on the observer existing, and you have 1 in both cases, or you don't condition it on the observer and you have p^-1000 in both cases. You can't have it both ways.