On 29 Apr 2011, at 04:03, Stephen Paul King wrote:
But are machine semantics restricted to a position basis mode of
That was the question I as asking. Probably not, but I am not sure.
Even pure spin computations needs the use of position, at least for
reading and writing memories. But this might be a human limitation,
not a machine limitation.
I can see how this would do damage claims of universality!
Why? I don't see this at all. Remember that with comp the numbers are
only dreaming space and position. Such notion are secondary and
emerging from the numbers points of view.
This is a open problem for me as well as my toy model is only framed
in the position basis at the moment and I do not know how to
generalize it at the moment, but I have seen hints in the C* algebra
duality of Gel’fand. arxiv.org/pdf/0812.3601 and www.mathstat.dal.ca/~p.l.lumsdaine/research/Lumsdaine-2009-Duality.pdf
QM seems to demand that all possible basis be treated equally,
there can be no preferred basis (via the linearity of the tensor
product of Hilbert spaces?!); just as there can be no preferred
reference frame in GR. http://www.physicsforums.com/showthread.php?t=362959
Yes. I agree. There are no preferres basis, like they are no preferred
universal system. That is why I take the numbers.
“The preferred basis problem is arguably a more serious problem for
a splitting-worlds reading of Everett. In order to explain our
determinate measurement records, the theory requires one to choose a
preferred basis so that observers have determinate records (or
determinate experiences) in each term of the quantum-mechanical
state as expressed in this basis. The problem is that not just any
basis will do this. Making the total angular momentum of all the
sheep in Austria determinate by choosing such a preferred basis to
tell us when worlds split, would presumably do little to account for
the determinate memory I have concerning what I just typed. But this
is the problem, we do not really know what basis would make our most
immediately accessible physical records, those records that
determine our experiences and beliefs, determinate in every world.
The problem of choosing which observable to make determinate is
known as the preferred-basis problem.”
There is no splitting, both with Everett and comp. Only relative
states. The 3-states are defined relatively to universal numbers., and
the 1-states are defined relatively to infinities of universal numbers
(the infinitely many competing below our substitution level).
That we humans have a bias toward the position basis may very
well be an artifact of our physical senses. It is interesting to
note that bases exists that are combinations of other bases. Some
research by Aharonov et al in the so called Weak Measurement area
shows some unusual implications of this: http://en.wikipedia.org/wiki/Weak_measurement
I suspect that the “basis problem” is just another version of
the measure problem.
I think there is no basis problem. All versions of it comes from a
too much literal understanding of the notion of world or universe
(which makes no sense with comp).
Also, I think that the measure problem in QM is mainly solved by
Gleason theorem. And the measurement problem is solved by Everett MW.
I might be wrong (if Weinstein is correct, for example). Comp is far
from being as clean as QM, though, but it should lead to QM, with
perhaps some modification, which might solve the remaining problems.
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