On 9/27/2019 4:57 AM, Bruce Kellett wrote:
On Fri, Sep 27, 2019 at 9:30 PM Alan Grayson <agrayson2...@gmail.com <mailto:agrayson2...@gmail.com>> wrote:

    On Friday, September 27, 2019 at 5:25:25 AM UTC-6, Bruce wrote:

        On Fri, Sep 27, 2019 at 8:38 PM Alan Grayson
        <agrays...@gmail.com> wrote:

            On Wednesday, September 25, 2019 at 6:56:31 PM UTC-6,
            Brent wrote:


                Except every measurement ever made in every experiment
                ever run.


            *But if every interaction with the environment in
            decoherence satisfies unitary time evolution, how can the
            result deny unitary time evolution? AG *


        Every measurement ever made gave only one result. This means
        that unitarity is violated in giving that single result rather
        than a superposition. Understanding the reason for this might
        require some more work.

        Bruce


    *If you've done that work and are convinced that unitary time
    evolution is violated when a measurement occurs, is this
    tantamount to claiming that the wf collapses? AG *


I don't claim to have done the work to show how this happens. But collapse is one possibility.

"Collapse" is certainly the case if you take an epistemic view of the wave-function: measurment=>new information=>new wave function.

Brent

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