From: Bruce Kellett
Sent: Tuesday, October 27, 2015 6:54 AM
[....] But to make sense of this mathematically you have to get rid of the
unwanted correlations. Most do this by fiat -- the worlds are orthogonal
FAPP. But that is not principled either. Mathematically, we take a partial
trace. But we take the trace, it is not in Schroedinger's equation.
### There are interesting difficulties when two (or more) observers have
knowledge of one physical system.
http://arxiv.org/abs/quant-ph/0107151
"Whose Knowledge" by Mermin
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