Jason, imagine a universe, by physical laws, where its easy to interact with 
other clones of our own universe, and version of earth, but it's far more 
difficult to travel without titanic amounts of energy. So Earth 1 x 119^42nd, 
(ourselves) trades peacefully, with Earth 1 x 20^905, but is in a constant 
state of war, with Earth 1 x 7231 (The Greater Mongolian Empire). In some 
universe, High Everett the 3rd, in a medically, advanced, Earth, is laughing 
his ass off at us :-(  



-----Original Message-----
From: Jason Resch <jasonre...@gmail.com>
To: Everything List <everything-list@googlegroups.com>
Sent: Fri, Nov 24, 2017 8:48 pm
Subject: Re: Consistency of Postulates of QM







On Fri, Nov 24, 2017 at 1:15 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:





I was just explaining that a measurement is any memorable interaction, which is 
simplest to illustrate with a tensor product of Alice (|A>)and a simple 
superposition. In your notation: |A> (|UP> + |DN>) = |A> |UP>  + |A> |DN> .


In the case of the singlet state, it is more subtle, as  |UP>|DN> - |DN>|UP> 
describes a many-worlds with Alice having a spin in any direction, and Bob, too 
but the opposite relatively to each others (the notation is misleading). We 
must keep in mind the rotational invariance of the spin. So we the Alice Bob 
situation is more intricate and tedious to describe. 
Sometimes I referred to the simple account of this in the Everett FAQ by 
Michael Clive Price, but it seems not available since some times. We have 
copied the relevant details in previous discussions though, so you might try to 
find it in the archives with the key word "Michael", or something. I have 
unfortunately not the time "here and now".  Later perhaps. With Everett, it is 
important to reason independently of the bases in between the measurements.


I guess you see that violation of the BI leads to "action at a distance" if we 
assume a collapse, or a mono-world theory.  I don't see Bell' argument applying 
in the MW context, though.


Bruno








Bruno,


Is this the Many Worlds FAQ you were referring to? 
http://www.anthropic-principle.com/preprints/manyworlds.html


I think the parts relevant to EPR, Bell Inequality and Locality (for those 
interested) are Q12 and Q32.


Jason


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