On 5/10/2013 1:00 AM, Bruno Marchal wrote:

On 09 May 2013, at 18:08, meekerdb wrote:

On 5/9/2013 1:44 AM, Bruno Marchal wrote:
I don't think that requires a wave function collapse, it's explained by Everett's MWI also, which is a kind of non-local hidden variable.

Why non local? There is nothing non local in Everett's MWI.

Sure it is. When you take the trace of the density matrix over the environment to get a set of orthogonal subspaces that's a non-local, mathematical operation.

Local is about physical reality, not mathematical operation. The wave describing the physical (physicists included) evolves deterministically and locally. Non locality is in the (mathematical) appearances.

In an EPR type experiment the wave-function's evolution is not local. It changes over a space-like interval.


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