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Stuart_Armstrong comments on Avoiding doomsday: a "proof" of the self-indication assumption - Less Wrong
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"Other things equal" is a huge obstacle for me. Without formalizing "other things equal", this is a piece of advice, not a theorem to be proved. I accept moving from A->F, but I don't see how you've proved SIA in general.
How do I go about obtaining a probability distribution over all possible universes conditioned on nothing?
How do I get a distribution over universes conditioned on "my" existence? And what do I mean by "me" in universes other than this one?
I don't need to. I just need to show that if we do get such a distribution (over possible universes, or over some such subset), then SIA update these probabilities. If we can talk, in anyway, about the relative likelyhood of universe Y versus J, then SIA has a role to play.