On 7/1/2012 4:59 AM, Bruno Marchal wrote:

On 01 Jul 2012, at 09:41, meekerdb wrote:On 7/1/2012 12:17 AM, Bruno Marchal wrote:On 30 Jun 2012, at 22:31, meekerdb wrote:On 6/30/2012 12:20 PM, Bruno Marchal wrote:On 30 Jun 2012, at 18:44, Evgenii Rudnyi wrote:I think that you have mentioned that mechanism is incompatible with materialism.How this follows then?Because concerning computation and emulation (exact simulation) all universal systemare equivalent.Turing machine and Fortran programs are completely equivalent, you can emulate anyTuring machine by a fortran program, and you can emulate any fortran program by aTuring machine.More, you can write a fortran program emulating a universal Turing machine, and youcan find a Turing machine running a Fortran universal interpreter (or compiler).This means that not only those system compute the same functions from N to N, butalso that they can compute those function in the same manner of the other machine.But the question is whether they 'compute' anything outside the context of a physicalrealization?Which is addressed in the remaining of the post to Evgenii. Exactly like you canemulate fortran with Turing, a little part of arithmetic emulate already all programfortran, Turing, etc. (see the post for more).Except neither fortran nor Turing machines exist apart from physical realizations.Of course they do. Turing machine and fortran program are mathematical, arithmeticalactually, object. They exist in the same sense that the number 17 exists.

Exactly, as ideas - patterns in brain processes. Brent

We can implement them in physical system, but this does not make them physical.They are abstractions.If you want. This changes nothing.There is no need of step 8, here. It is just a mathematical fact that arithmeticemulates all programs, in the mathematical sense of "emulate".That's a metaphorical sense.Not at all."Arithmetic" doesn't act or perform anything,Acting and performing are the metaphor here. Computation is a purely mathematical notiondiscovered before the building of physical computer. Some could even argue that thephysical reality can only approximate them.

Right. They are idealizations.

And with comp we have to define eventually notion like acting and performing from therelation between numbers, and this is rather easy to do.

`That doesn't follow. Comp only says that we could substitute some different physical`

`structure for part (or all) of a brain, and so long as the input/output functions were`

`always the same consciousness would be unchanged. So comp allows that we may still need a`

`physical realization of the functionality. That this can be described by relations`

`between numbers does not entail that it is replaceable by the abstraction.`

What is difficult is to get the right measure on the computations, not to define actionand performance.I am explaining what is a computation on the FOAR list, but you can find it also in anytextbook on theoretical computer science. No notion of physics are involved at all inthe definition.

`But those definitions are concerned with abstracting away the physical, since the physical`

`realization can be different for (approximately) the same function. It is no different`

`than abstracting apples and oranges as fruit so that we can add one apple to one orange`

`and get two fruit. It doesn't make apples and oranges the same thing.`

Brent

it's concept and a static, timeless one at that.Like all arithmetical truth. Time is a view from inside. That is the case in somephysical based theories (for example in all theories admitting block universe).Bruno http://iridia.ulb.ac.be/~marchal/

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