On Wed, Oct 9, 2019 at 10:24 AM 'Brent Meeker' via Everything List <
[email protected]> wrote:

>
> On 10/8/2019 2:59 PM, Philip Thrift wrote:
>
> That sounds reasonable. Indeed, it is reasonable. It is just as reasonable
> as the measurement postulate. In fact, it is logically entirely equivalent
> to the measurement postulate.
>
>
> It's not clear here what "logically" equivalent means.  It is
> instrumentally equivalent...which is why it's an interpretation and not a
> different theory (as GRW is).  It's different from the measurement
> postulate in that the measurement postulate says the wave function
> instantaneously changes to match the observed measured value.  MWI says
> those other measured values obtain in other orthogonal subspaces of the
> Hilbert space and you are only observing one.  Those are not "logically"
> the same.
>

What do you mean by "logically equivalent"? It seems to me that if two
assumptions fulfil the same explanatory role -- they are functionally
equivalent -- then it is sensible to call them "logically equivalent". They
fulfil the same logical role in the argument.

Bruce

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