On 13 Dec 2017, at 04:04, Brent Meeker wrote:
On 12/12/2017 6:21 PM, John Clark wrote:
> He seemed to claim it negated the main claim of MWI, that
everything that CAN happen, DOES happen.
I don't see how.
I pointed out that is inconsistent with SWE to say that anything
possible actually happens. "Possible" needs to be qualified. For
example the SWE in a Young's slit experiment tells you that the
probability of a particle striking the detector is zero at some
places. It's logically possible for a particle to strike there, but
not nomologically possible. Similary if you measure the value of a
variable for a state you can only get values that are eigenvalues of
the operator. Others are logically possible, but not nomologically.
Provable and consistent (possible) depends on the theory which is
postulated. If QM is derivable from arithmetic, as it should if
Computationalism is true, then there is a sense to say that what you
call nomological impossibility is also logically impossible, or at
least arithmetico-logically impossible. Here you use the assumption of
physicalism implicitly. I single that out, because that implicit
assumption is a frequent source of misunderstanding of the
consequences of computationalism.
Bruno
Brent
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