On 1/19/2014 2:43 AM, Bruno Marchal wrote:
I also find it unlikely that the subst level is above the quantum level. Or at least I
think that if it's at the quantum level then we can guarantee that the duplication
arguments would work (assuming we could duplicate objects at that level, which we can't
due to a fundamental principle...!)
It can, just above that level. And also below, because the UD does not need to duplicate
your body, only the part of the body doing the computations, and so the UD needs only to
prepeare the multiple copies, so the UD argument go through at step seven, even if the
subst level is below the quantum uncertainty level.
There is not only the level of substitution, there is the scope. When you say 'yes' to
the doctor, the doctor is only going to replace a part of you and leave the rest of the
world intact. But the rest of the world also contributes to your computation. When you
write, "only the part of the body doing the computations" you are implicitly ignoring
computation done in other parts of your body - which may not be important for mathematical
theorizing but may be important for deciding to take your finger out of the fire. This is
the source of my dissatisfaction with the MGA. It implicitly assumes you can cut off this
interface between "the part of you doing computations" and the rest of the world by
anticipating all the possible interface events. I don't think that can be done.
Brent
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