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Luke_A_Somers comments on Debugging the Quantum Physics Sequence - Less Wrong Discussion
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You don't smuggle it in as an ansatz.
You apply the generalized anti-zombie principle. There was a reason he went there first.
But that just tells you that other branches are conscious too. It doesn't give you the Born rule. So it is an ansatz, it's a guess about what formula to use. And until you can derive it from the unitary evolution rule, it counts separately towards the complexity of your model.
If you get as far as allowing that the other branches are conscious - no, simply that you even HAVE branches, and they should be related by probabilities that don't change retroactively - then you have been granted sufficient grounds to derive the Born Rule.
It's getting that far that's the hard part.
EDIT: I've provided this derivation already, here Does that help?