On Mon, Mar 02, 2015 at 07:52:57PM -0800, meekerdb wrote:
> On 3/2/2015 5:49 PM, Jason Resch wrote:
> >Maybe that's enough though, to implement a brain and observer,
> >that they stop interfering in at least one basis (assuming they're
> >not contradictory, might all bases exist?)
> 
> Bases are just coordinate systems for Hilbert space.  We choose
> them.  Of course that doesn't keep Platonists from supposing they
> exist, but physicists generally assume coordinate dependent things
> measure up to their standard of "exists".  If brains and observers
> exist they should have some coordinate independent definition.
> 

Or perhaps they define their own coordinates. The person who choses to
measure momentum is simply a different person to the one chosing to
measure position. And the basis is correspondingly defined.

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