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Tyrrell_McAllister comments on Evidential Decision Theory, Selection Bias, and Reference Classes - Less Wrong
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I wrote a brief mathematical write-up of "bare bones" UDT1 and UDT1.1. The write-up describes the version that Wei Dai gave in his original posts. The write-up doesn't get into more advanced versions that invoke proof-length limits, try to "play chicken with the universe", or otherwise develop how the "mathematical intuition module" is supposed to work.
Without trying to make too much of the analogy, I think that I would describe TDT as "non-naive" CDT, and UDT as "non-naive" EDT.
In this writeup it really seems like all of the content is in how the mathematical intuition module works.
This is not much of an exaggeration. Still, UDT basically solves many toy problems where we get to declare what the output of the MIM is ("Omega tells you that ...").