# Re: Reality Check: You Are Not a Computer Simulation [Audio]

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On 21 Nov 2012, at 11:32, Roger Clough wrote:```
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```Hi Bruno Marchal

I'm trying to understand your paper, but a seemingly much simpler
form of your argument keeps getting in the way. The
simpler form is the Lucas argument, discussed in  great
scholarly detail on

http://www.iep.utm.edu/lp-argue/
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To be franc there is nothing new in that paper, on the contrary it fails to mention the work done by Webb (not to talk on mine on Lucas, Benacerraf and the Penrose argument).
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I have counted more than 50 errors in Lucas paper. Some are uninteresting, and some are very interesting. The argument of Lucas and Penrose are typically invalid, but it can be corrected, and it leads to the proposition according to whioch:
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If I am a machine, then I cannot know which machine I am, and this plays some role in the formal part of the study of the first person indeterminacy.
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Lucas and Penrose assumes that they are sound, and that they know that they are sound, but this is already inconsistent, even if the soundness is restricted to arithmetic.
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In Conscience & Mechanism, I show how all Löbian machines can refute Lucas and Penrose. Basically they confuse []p (3p beliefs) with []p & p (1p knowledge)..
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It seems to me to be self-evident that

1p cannot be part of 3p
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But that is good insight of you. For correct machine, this can be proved, as the machine cannot prove the true equivalence between []p and []p & p, as they don't know that they are correct.
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[]p can be defined in the language of the universal machine, but []p and p cannot. By assuming correctness of some other machine, the Löbian one can prove that for simpler machine than themselves, and they can bet on their correctness and lift that idea at their own level, with the usual theological risk of this (forgetting the "bet" in the process).
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Which seems to be a equivalent to Godels's theorm.
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OK, but invalid when used to pretend that we are not machine, like Godel and Lucas did.
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Or the observer can't be part of what is observed.
Or more generally, the prover cannot be part of the proof.
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Well, both the observer (3p) and the prover (3p) can do that, without necessarily knwoing that they do that.
```But the knower (1p) cannot.

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To explain the details of this would need more familiarity in logic, and notably Solovay's theorems, which I might explain someday.
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Bruno

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```

[Roger Clough], [rclo...@verizon.net]
11/21/2012
"Forever is a long time, especially near the end." -Woody Allen

----- Receiving the following content -----
From: Bruno Marchal
Time: 2012-11-20, 10:05:13
Subject: Re: Reality Check: You Are Not a Computer Simulation [Audio]

On 20 Nov 2012, at 14:51, Roger Clough wrote:

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```Hi Bruno Marchal

Sorry, where are the steps of UD ?
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You can find them here:

http://iridia.ulb.ac.be/~marchal/publications/SANE2004MARCHALAbstract.html

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You can download the PDF, and also the unique slide with a diagram for each step, as this can help to remember them. For the step 8, the best version is in this list in the MGA thread (the Movie Graph Argument). The seven first steps already explains the reversal physics---/---number's bio-psycho-theo-logy though.
```
Bruno

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```

[Roger Clough], [rclo...@verizon.net]
11/20/2012
"Forever is a long time, especially near the end." -Woody Allen

----- Receiving the following content -----
From: Bruno Marchal
Time: 2012-11-19, 09:33:19
Subject: Re: Reality Check: You Are Not a Computer Simulation [Audio]

On 19 Nov 2012, at 11:22, Roger Clough wrote:

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```Hi Bruno Marchal

I thought that comp is exactly opposite to what you say,
that computationalism is the belief that we can simulate
the mind with a computer program-- that the mind is computable.
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Yes that is correct (if by mind you mean the 3p feature of mind, and not consciousness per se).
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What I wrote in the quote (below) is that the physical reality is not completely Turing emulable, once we assume the mind is.
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Comp is just the idea that I can survive with a computer at the place of the brain. This does NOT mean that a computer create the consciousness. It means only that the consciousness can only be made manifestable through relative bodies, but it exists only in Platonia. But then matter too, and it relies statistically on all computations going through my current comp states, and the math shows that this will include some continuous/analog observable.
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I am not sure this can be understood without getting a personal understanding of at least the first seven step of the UD reasoning.
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Bruno

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```
[Roger Clough], [rclo...@verizon.net]
11/19/2012
"Forever is a long time, especially near the end." -Woody Allen

----- Receiving the following content -----
From: Bruno Marchal
Time: 2012-11-18, 07:46:20
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Subject: Re: Reality Check: You Are Not a Computer Simulation [Audio]
```
On 17 Nov 2012, at 22:25, meekerdb wrote:

>
>
> -------- Original Message --------
>
>>
>> * Overview
>> _Is Quantum Reality Analog after All?_
>>
(http://www.scientificamerican.com/article.cfm?id=is-quantum-reality-analog-after-all
>> )
>>
>>
>>
>> Conventional wisdom says that quantum mechanics is a theory of
>> discreteness, describing a world of irreducible building blocks.
>> It stands to reason
>> that computersÿÿwhich process information in discrete
>> chunksÿÿshould be able
>> to simulate nature fully, at least in principle. But it turns out
>> that
>> certain asymmetries in particle physics cannot be discretized;
>> they are
>> irreducibly continuous. In that case, says David Tong, author of
>> "_Is Quantum
>> Reality Analog after All?_
>>
(http://www.scientificamerican.com/article.cfm?id=is-quantum-reality-analog-after-all
>> ) " in the December 2012 issue of
>> Scientific American, the world can never be fully simulated on a
>> computer.

That would be a nice confirmation of comp. As I have often insisted
digital physics (the world can be fully be Turing emulated) violated
the consequence of comp which makes necessary the presence of non
computable observable, and even non enumerable spectra.

Digital physics is self-contradictory. It implies comp, but comp
implies the negation of digital physics, so, with or without comp,

Bruno

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

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