```Hi David,

I promise to give you more explanation on my work. Somehow I don't know
really where to begin. I know I should not be to technical too (if not,
Norman Samish will accuse me to make the reader leaving the list ;).```
```
What I have done can be divided into two parts:

UDA  =   The Universal Dovetailer Argument  (= the seven first step of
the current "eight steps" version).
AUDA  =  The Arithmetical Dovetailer Argument (alias the interview of
the Lobian Machine)

In SANE I have collect them in one large 8th steps version called UDA,
but I will come back to my Brussels-Lille version where I separate UDA
from the Graph-Movie and/or AUDA.

I will use the following acronyms:

YD = "yes doctor" = the position of some computationalist practionners
saying yes to his doctor's proposition of having an artificial digital
brain substitution.

CT is Church Thesis. It is the thesis that all computers in Platonia
(that is, here,  in any place with unbounded memory and space
capacities) are equivalent with respect to the class of computable
function from N to N. I will have to explain you why and how CT makes
the notion of computability absolute, and the notion of provability
relative.

AR = Arithmetical Realism = the doctrine that elementary arithmetical
propositions are true or false independently of me, you, etc.

COMP = computationalism = YD + CT + AR.

UDA is an argument showing that COMP + "there exist a physical running
UD" entails the reduction of physics to number theory/computer science.

So with OCCAM you can already eliminate the hypothesis that there is
physical running UD, and thus that there is any need for a physical
universe.

things far more explicit in two ways, and that is the step 8 of the
"UDA" in the last version of it.

The first way is the MGA, the Movie Graph Argument. It eliminates
almost completely the use of OCCAM.
The second way is AUDA. To applied it on the natural world you still
have to use the usual form of OCCAM in the natural science, but AUDA
eliminates completely the use of "YES DOCTOR". The trick is to
interview the universal machine, instead of interviewing *you* like in
the UDA (seven steps).

Hmmm... So yes. I prefer to call UDA the seven first steps (unlike what
I have done in my SANE paper).

Let us say that this post was just a refreshing of the acronyms. Is it
OK up to here? Have you a good understanding of the seven first step of
the SANE paper ?   Cf:
http://iridia.ulb.ac.be/~marchal/publications/SANE2004MARCHAL.htm

Bruno

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

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