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Liron comments on Causal Reference - Less Wrong
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Just for the Least Convenient World, what if the zombies build a supercomputer and simulate random universes, and find that in 98% of simulated universes life forms like theirs do have shadow brains, and that the programs for the remaining 2% are usually significantly longer?
How can the version without shadow brains be significantly longer? Even in the worst possible world, it seems like the 2% of non-shadow-brain programs could be encoded by copying their corresponding shadow-brain programs and adding a few lines telling the computer how to garbage-collect shadows using a straightforward pruning algorithm on the causal graph.
by the programs being short enough in the first place that those few lines still doubles the length? By the universe like part not being straightforwardly encoded so that to distinguish anything about it you first need a long AI-like interpreter just to get there?