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DavidAgain comments on On Being Decoherent - Less Wrong
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Comments (77)
I think the obvious reply here is 'keep reading to the end of the Sequence'! After all, quite a lot of space is devoted to looking at different models.
On the Occcam's razor point, the question is what we're endeavouring to make simple in our theories. Eliezer's argument is that multiple worlds require no additions to the length of the theory if it was formally expressed, whereas a 'deleting worlds' function is additional. It's also unclear where it would kick in, what 'counts' as a sufficiently fixed function to chop off the other bit. It's not clear from your post if you think the other half's chopped off because we haven't observed it, or we don't observe it because it's chopped off!
The other point is that if we are 'Human-LEFT' then we don't expect the other part of the wave function to be observable to us. Does that mean we delete it from what is real? The post addressing that question in a context divorced from QM: http://lesswrong.com/lw/pb/belief_in_the_implied_invisible/
Is there a formal expression of the theory of measurement (in a universally agreed upon language) where this can be demonstrated?
Not a clue. But in this particular case, the argument is that the theory without mutliple worlds is precisely the multi-worlds theory with an extra postulate, so it's certainly more complicated.
It would really help if some people who knew about the relevant parts of the Sequences lurked around to aid the confused!