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Eliezer_Yudkowsky comments on Torture vs. Dust vs. the Presumptuous Philosopher: Anthropic Reasoning in UDT - Less Wrong
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Suppose we modify the situation so that there is an infinite list of possible Theories of Everything, T1, T2, T3, ... With each theory predicting a trillion observers, a trillion trillion observers, a trillion trillion trillion observers, and so on. Additionally, from some other prior info gleaned from scientific insight, the probability of Tn being true is 2^(-n).
SIA here would suggest we live in the universe with the most observers... which in this case doesn't exist.
Huh! This provides a surprisingly non-zero amount of justification for an intuition I thought was probably just me being stupid - namely my attempt to rescale my utilities as fractions of the total number of observers or integral of observer-moments inside a universe, for purposes of cross-universe comparison.