On 13 Sep 2016, at 00:46, [email protected] wrote:


[SNIP]



On Monday, September 12, 2016 at 2:14:18 AM UTC-6, Bruno Marchal wrote:

On 11 Sep 2016, at 20:48, [email protected] wrote:






You create them by virtue of what you DO, say in an experiment. Or do you back off from the apparent requirement of the MWI that all possible outcomes are measured somewhere, somehow?

You don't create them at all, no more than you create the moon by looking at it. You just localize yourslef relatively to the more probable (numerous, weighted) relative branche(s).th

What if the probability is 50-50 as in a spin experiment? How is the choice made?. But more important, since I've never done one, will the alternative histories pre-exist if I decide one day to do such an experiment? AG


Have you read the sane04 paper?

No. I wouldn't know where to find it,


I gave you the link:
http://iridia.ulb.ac.be/~marchal/publications/SANE2004MARCHALAbstract.html

Click on the paper, and on the slide. The slide reminds a decomposition of the reasoning in eight simple (but not all that simple) steps.

Don't stay too long in the catalog of people criticizing a work before studying it. You might end in the category of people who get the point but lies to save their face.




but more important the theory doesn't appeal to me.

?

Non-computationalism relies on actual infinities, or magical souls, or naïve fairy tales. Like Diderot understood, with many atheists, Mechanism is the default assumption of the rationalist. Mechanism makes eventually all notion of primary matter into phlogiston-like concept. The point is that if Mechanism is true, the appearance of matter has a testable explanation, not relying on assumed substance or materiality, or physical concepts. Mechanism is not compatible with physicalism, nor even entirely with mathematicalism, there are some subtleties here, depending on the bet on digitalism, which belongs to theology, and only to math in "God's eye" (some relations are true, but only without saying them)..




I could be wrong, but it apparently relies on human memories


?




and seems solipsistic.


Some modalities of self-reference are machine-solispistic, like the modalities related to the subject (for the others: S4Grz, S4Grz1, X, X*, X1, X1*). But numbers, computation and the core of matter should have a first person plural reality (G, G*, G1, G1*, Z, Z1, Z*, Z1*), and the whole thing is a many mind structure, hardly solipsistic.

The passage from S4Grz (or X) to G (or Z) is when the machine can discover "not-me" and can bet on the existence of the others, and when histories can be shared among classes of multiple observers.




I think, without appealing to any theory or paper, you could answer the question directly about the preexistence of alternative states or histories.

Yes, everything preexist(s) in some sense, as everything (objective and subjective) is derived from addition and multiplication of numbers.

The crazy thing here (that addition and multiplication are, taken together with a bit of logic, already Turing universal) is not mine, although this is not well known and I am often considered as crazy on a point which is very basic for mathematical logicians.





If I do a cat experiment, do I create the alternative states or histories, or are they preexisting? AG


There is only true (and false) relation between numbers, but the computable one direct a differentiating flux of consciousness, with a very complex mathematical structure (the modal logics give only the "simple" propositional level, but we can explore the quantified version: it is a matter of work).

So when you do the cat experiment, you, relatively to here-and-now, let the (1p) consciousness flux differentiates in (not two, it is always aleph_0 at the least) "preexisting" (yet in an epistemological sense: they are derived notion/experience) computational histories (defined in term of self-referential number relations).

Bruno






http://iridia.ulb.ac.be/~marchal/



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