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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