On 1 Sep, 18:08, Brent Meeker <meeke...@dslextreme.com> wrote:

> How did we get from a hypothetical that "I am virtualised" to something
> being *forced*?  This is like saying "I might be virtualised" entails "I
> must be virtualised".

CTM postulates that "my mind is a computation".  The standard rider is
"...of my brain', but if you buy the reductio argument, this second
part is dismissed as incompatible with the first.  Hence, on this
basis, accepting CTM becomes equivalent to accepting "I am
virtualised".  Yes?

David

> David Nyman wrote:
> > 2009/9/1 Flammarion <peterdjo...@yahoo.com>:
>
> >> I claim that that is a *possiblity* and as such is enough
> >> to show that CTM does not necessarily follow from the computability of
> >> physics.
>
> > It may be easy to lose sight, in the flurry of debate, that the
> > argument is against CTM+PM.  AFAICS nobody is claiming that the
> > assumption of CTM is *forced* by the computability of physics,
> > although the contrary would of course argue against it.  Rather, *once
> > CTM is assumed* the entailment on the basis of UDA-8 is that PM is
> > false, or at best superfluous.  If we can't get past this point, we're
> > doomed to go round in circles.
>
> >> The CTM does indeed have hypotetical implciations about
> >> virtualisation, but nothing follows from that. There is no
> >> implication from "I might be virtualised" to "I am virtualised" any
> >> more than from "I might be  BIV.."
>
> > On the contrary, the insight that Bruno points out is that the force
> > of CTM consists precisely in the *assumption* that "I am virtualised";
> > else it has no force.  This is the point.  UDA-8 is then designed to
> > expose the entailment that "my generalised environment is virtualised"
> > is thereby also forced.  Consequently the CTM is forced to be a theory
> > of mind-body, or else nothing.  
>
> How did we get from a hypothetical that "I am virtualised" to something
> being *forced*?  This is like saying "I might be virtualised" entails "I
> must be virtualised".
>
> Brent
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