Technologos comments on Torture vs. Dust vs. the Presumptuous Philosopher: Anthropic Reasoning in UDT - Less Wrong
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Even if we somehow constrained the number of observers to be bounded above by (e.g.) the number of cubed Planck lengths in the universe, our hypothesis under SIA would be... that all such cubes did in fact contain an observer?
That's just a way the universe could turn out to be bigger, not the only way.
Indeed. I just was suggesting that, insofar as we have no evidence of the massive number of observers under SIA, we would have to invent rather unsupported models of the world in order to implement it.