On 25 February 2014 16:54, chris peck <[email protected]> wrote:
> Hi Liz > > *>> I can't see why the MWI's existing explanation of probability needs to > have anything added.* > > I can't see that MWI has an explanation of probability. > > > > > *>>Probability in the MWI is deduced from the results of measurements by > an experimenter. Effectively, if they assume that they inhabit a > non-branching universe, they will regard the proportion of times a > measurement comes out one way (spin up say) as the probability of that > result occurring. If they assume an MWI perspective, however, the > probabilty of that outcome is a measure of the proportion of experimenters > who will be found in the spin-up branch.Is there something wrong with that?* > > It doesn't really address the issue. It doesn't address the question 'what > can I expect to see'. Of course, I can say this set of future mes will > inhabit a spin up branch and this set of future mes will inhabit a spin > down branch. So, this proportion of future mes will see spin up and this > portion will see spin down. > > Asked what I (present me) can expect to see: well I can expect to see spin > up and spin down.... Asked to assign a probability to seeing either result > I assign 1 to both. > You should assign 1 to seeing both in your "multiversal form" - you will split. This is basically a misuse of the term probability because it's a deterministic outcome (but appears probabilistic). > > Theirs is a method of calculating frequencies of me seeing ups and downs > but not probabilities of seeing up or down. > So what's wrong with that? As I said our "expectation of probability" in the MWI is based on what happens after the measurement. There is no actual probability from the MWI perspective, only certainty. We only think there is if we don't take an MWI view (similar to the 1p vs 3p distinction in comp). -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
