On 7/1/2012 12:25 AM, Evgenii Rudnyi wrote:
On 30.06.2012 22:31 meekerdb said the following:
On 6/30/2012 12:20 PM, Bruno Marchal wrote:
On 30 Jun 2012, at 18:44, Evgenii Rudnyi wrote:
I think that you have mentioned that mechanism is incompatible
with materialism. How this follows then?
Because concerning computation and emulation (exact simulation) all
universal system are equivalent.
Turing machine and Fortran programs are completely equivalent, you
can emulate any Turing machine by a fortran program, and you can
emulate any fortran program by a Turing machine.
More, you can write a fortran program emulating a universal Turing
machine, and you can find a Turing machine running a Fortran
universal interpreter (or compiler). This means that not only those
system compute the same functions from N to N, but also that they
can compute those function in the same manner of the other
machine.
But the question is whether they 'compute' anything outside the
context of a physical realization?
Personally I am not sure if they compute anything even in a physical realization. To
make my point, let us consider some device that implements a PID controller, the
equation is in Wikipedia
http://en.wikipedia.org/wiki/PID_controller#PID_controller_theory
Now let us start with the M-theory (or any other) and consider the functioning device in
this framework. There is dynamics and evolution of superstrings, however it is unclear
to me what happens with the equation for the PID controller in this context. Does it
mean that the M-theory computes the equation of the PID controller?
I think that's mixing up models with the thing modeled. If there is a device which is PID
controller and it is running and controlling something, then we have a set of equations
that describes and predicts what will happen, to a good approximation. We might program a
computer to compute what that model predicts.
M-theory is a speculative theory about matter that, if it's correct, would be the basis of
a predictive model of the behavior of the matter making up the device which is a PID
controller at a very low level of detail (e.g. elmentary particles and fields).
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