# Re: are we in a simulation?

From: Stephen Paul King <stephenk1.domain.name.hidden>
Date: Thu, 12 Jun 2003 23:54:57 -0400

Dear George,

Interleaving.

----- Original Message -----
From: "George Levy" <glevy.domain.name.hidden>
To: "Everything List" <everything-list.domain.name.hidden>
Sent: Thursday, June 12, 2003 10:58 PM
Subject: Re: are we in a simulation?

> Hi Stephen,
>
>
>
> Stephen Paul King wrote:
>
> > Dear Friends,
> >
> > Does computational complexity (such as NP-Completeness, etc.)
> > and computational "power" requirements factor into the idea of
> > simulated worlds?
> >
> >
>
> It may. Also important is the issue that Tegmark raised in the
> Scientific American article about the ordering of an infinite set. The
> probability of the occurence of an element of any subset (say the even
> numbers) can be altered depending on how the element of the set (say the
> natural numbers) are ordered.

[SPK]

Is this related to what D. Deutsch mentions regarding the "measure on
the ensemble" in his paper "It From Qubit"? It might also be related to the

>From http://www.andrew.cmu.edu/~cebrown/notes/vonHeijenoort.html :

"The Burali-Forti paradox deals with the "greatest ordinal"--which is
obtained by assuming the set of ordinals is well-ordered [and, of course,
that it is a set!]--which must be a member of the set of ordinals and
simultaneously greater than any ordinal in the set."

>
> So if we assume that the multiworlds are an infinite set, to compute the
> probability of any event we need to know how the multiwords are ordered.
> I conjecture that the ordering should be anthropy related.
>

[SPK]

Do you mean "entropy"?

> Let's consider a double slit diffraction experiment. The multiworlds are
> ordered according to the output diffraction pattern. Since the phases
> add up to produce this pattern, it seems that the process is linear,
> (thus simplifying computation) so computational complexity and
> computational power do seem to be of relevance.
>
> George.

[SPK]

I am still struggling with my intuitions regarding how to think of the
liner superposition of QM states as "multiple worlds". For one thing,
nowhere does there seem to be a place to embed the notion of an observer
other than the notion of the observable itself, but we don't have a formal
(or even informal!) way of defining the idea of a relation between and
"observer" and observables. Do you have any ideas?

Kindest regards,

Stephen
Received on Thu Jun 12 2003 - 23:56:16 PDT

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