> On 2 Mar 2020, at 14:02, Alan Grayson <[email protected]> wrote:
> 
> 
> 
> On Saturday, February 29, 2020 at 3:57:58 AM UTC-7, Bruno Marchal wrote:
> 
>> On 28 Feb 2020, at 23:03, Alan Grayson <[email protected] <javascript:>> 
>> wrote:
>> 
>> Among the infinite possibilities for the gravitational force, why, in the 
>> context of your theory, do we live in the world that apparently obeys the 
>> one consistent with Newton and Einstein? TIA, AG
> 
> I will answer this tomorrow.  
> 
> Bruno
> 
> I might have missed it. Please answer the above question here, keeping in 
> mind that the gravity formula in our world must have zero probability, given 
> the infinity of hypothetical equations.  TIA, AG 

I suggest we do this little step by little step. OK? It might help others too.

The 0th step is the definition I gave of Mechanism (aka Indexical Digital 
Mechanism). It is, as I think you have understood, the assumption that the 
brain/body works like a digital, or digitalisable machine, and that we can 
survive, at some relevant level of description, with an artificial digital 
body/brain. At this stage, the artificial brain is still physically 
implemented. 

That is what I will call step 0. You are not asked if you personally believe or 
not, in this. It is my basic assumption, from which, by reasoning, I will 
explain what you ask. 

More precisely, Mechanism is 

1) the Church Turing thesis (but this is used only in step seven, so don’t 
worry too much about it, before we get there). It is needed to obtain the 
purely mathematical definition of digital machine. Note that the Church-Turing 
thesis requires elementary arithmetic to make sense. I hope that you have no 
problem with 2+2=4, nor with deriving from "2+2=4" that "it exists a number x 
such that x + 2 = 4", OK?

2) it exists a level of description of my body such that I can survive with a 
digital artificial brain/body. I will just say brain, but if someone claim that 
the neural network in the belly plays a key role in his consciousness, the 
“artificial brain” will have to emulate that neural net too. The thought 
experiments are simpler when assuming a high level of description (like the 
neuronal level), but in step seven, this suppelemtary hypothesis will be 
discharged. The consequences will not depend on the choice of the substitution 
level. The brain might be the entire cluster of galaxies around us, described 
by superstring theory, with 10^34 decimals, and the reasoning will still go 
through, even if the shout experiment becomes unfeasible.

Any question up to here?

Bruno 




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