On 28 Dec 2013, at 18:43, Stephen Paul King wrote:
Dear Bruno,
On Sat, Dec 28, 2013 at 12:34 PM, Bruno Marchal <[email protected]>
wrote:
On 28 Dec 2013, at 07:34, LizR wrote:
On 28 December 2013 19:31, Stephen Paul King <[email protected]
> wrote:
Computed how? By what?
I know the answer to this one! To quote Brent -- "He proposes to
dispense with any physical computation and have the UD exist via
arithmetical realism as an abstract, immaterial computation."
Assuming comp, there is not much choice in the matter. That is the
point.
I will agree.
Above the substitution level: interaction between universal
machines, including one apparently sustained from below the
substitution level by the statistical interference between
infinities of universal machines getting your actual states.
But the "actual states" are not just some random string from my
point of view!
Nor for me. They are state brought by some computation above the S-
level, and supported by infinitely many computation below the S-level.
The result is indeterminate, but not itself random. In The WM-
duplication, the result is indeterminate or random, but W or M
themselves are not random.
The very fact that we can (somewhat) communicate is an important
fact. There is a selection mechanism: interaction.
That's part of the problem. Showing this.
I don't know how to avoid those infinities without reifying some God-
of-the-gap or Matter-of-the-gap notion to singularize a computation
for consciousness, but if that is needed for consciousness, then
comp is false.
Umm, that is a false choice! The FPI is good enough to "do the job"
without resorting to a 'god/matter in the gap" solution. The
singularization of consciousness is easy, as you have shown.
No it is not! There is a lot of work to be done before we have a realm
in which words like "interaction" can make sense.
It is the concurrent interaction problem that is not easy.
So let us concentrate on what is more easy first.
I cannot exactly predict your actions and thus can only "bet" on
your future states, but I can constrain your possible choices of
action with my physical behaviors even if the physical world is an
illusion. The fact that it is a common and persistent illusion makes
it a ground of commonality from which we can distinguish ourselves 3-
p wise from each other.
We cannot use physics.
True, you still survive with a digital brain, but no more through
comp, it is true from comp + some explicit magic to make disappear
the other realities. You get an irrefutable form of cosmic solipsism.
There is no magic here, there is the SAT problem. Boolean algebras
do not automatically pop out with global consistency over their
arguments/propositions. One has to actually physically "run" a
physical world to know what it will do. Claiming that it exists in
Platonia is not a solution.
No, it is a problem. And thanks to the work done, it is (with comp) a
problem in arithmetic. That is the result.
Bruno
http://iridia.ulb.ac.be/~marchal/
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