On 08 Jun 2015, at 19:29, meekerdb wrote:
On 6/8/2015 1:03 AM, Bruno Marchal wrote:
Hmm.... Let us be precise. That the computation take place in
arithmetic is a mathematical fact that nobody doubt today. UDA
explains only that we cannot use a notion of primitive matter for
making "more real" some computations in place of others. It makes
the physics supervening on "all computations in arithmetic".
But my computer does some computations and not others.
Not just yours. Mine too, and all those existing in arithmetic do -
some computations and not others.
So there must be some sense in which some computations are real and
others aren't.
It is the indexical sense, like in a block universe.
Handwaving that they're all there in arithmetic proves too much.
This is not proposed as an explanation, but as a mathematical fact
that we have to deal with. Then it is welcome as it explains, without
using observation, why nature looks like the MWI. This predicts
Everett QM, both intuitively (UDA) and formally (AUDA).
Bruno
Brent
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