# Re: What are wavefunctions?

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On 06 Jan 2014, at 16:40, John Clark wrote:```
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On Sun, Jan 5, 2014 at 1:28 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:
```>>>  Bell's theorem holds only under a certain set of assumptions,

>> True. As I've said many times Bell made exactly 3 assumptions:
1) High School algebra and trigonometry works.
2) Things are local.
3) Things are realistic.
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If those 3 assumptions are valid then Bell's inequality can NEVER be violated.
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> Yes, that is correct. You showed this correctly indeed.
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```>> But from experiment we know that Bell's inequality IS violated.
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> In our branch. Not in the multiverse.

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We do not know for a fact that the multiverse even exists, and even if it does those other universes are about as non-local as you can get.
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The point is logical and does not depend on the existence of a multiverse. The point is that Bell's inequality violation is seen in one branch, and that it entails physical non locality only if that branch is unique.
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All universes or branches of the multiverse are local. You can even define them by step of events close for interactions.
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The only branch we know to exist for sure is our local universe, and in our local universe Bell's inequality is violated.
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Yes, and a multiverse restores 3p determinacy and locality. That's the point.
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And even if those other universes are real Bell's inequality is violated there too, provided of course that High School algebra and trigonometry still works.
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Yes, and so, for those inhabitants who believe in determinacy and locality, they are forced to assume the presence of the other branches, like ours.
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> MW restores 3p determinacy, and it restores 3p locality

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I should have asked this long ago but who exactly is this third person?
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Just read the original papers.
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- In comp, anyone locally not duplicated, and observing a duplication of someone else, can play the needed role asked for defining a 3p view. - In Everett QM, the 3p is an external view of the solution of the SWE, and the 1-views are the record of the observers obeying to that wave.
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In both case, the 1p are given by the memory records of duplicated or superposed states, and the 3p is the view from those who observe the "whole" system.
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```Can you give me his phone number or at least his Email address?
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So funny ...

Bruno

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John K Clark

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http://iridia.ulb.ac.be/~marchal/

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