How useful are indefinite state spaces?

A. Neumaier

Quote by Hurkyl

What is expected is just that the joint object - measuring device - environment^* system undergoes unitary time evolution.

*: I hope you don't mind me making this obvious extension.

No, I don't.

My reply to your array of comments is in post #7 of the thread http://www.physicsforums.com/showthread.php?p=3128309

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