To compute a consistent universe with a low-entropy terminal condition and high-entropy initial condition, you have to simulate lots and lots of universes, then throw away all but a tiny fraction of them that end up with low entropy at the end.
Look at your explanation of entropy again, Eliezer. It's an expression of the multiplicity of equivalent-as-far-as-you-can-tell states. So, if you know you're going to have a low-entropy final state, then the entropy of the initial state has to be that low already in the beginning.
I guess that means you don't know that it's going to end up low entropy; most universes don't end up low-entropy, so you expect this one won't as well.
Today's post, Timeless Causality was originally published on 29 May 2008. A summary (taken from the LW wiki):
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This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Timeless Beauty, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
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