Brent Meeker wrote:
> Bruno Marchal wrote:
> > Le 05-juil.-06, à 15:55, Lennart Nilsson a écrit :
> >
> >
> >>William S. Cooper says: "The absolutist outlook has it that if a logic
> >>is valid at all it is valid period. A sound logic is completely sound
> >>everywhere and for everyone, no exceptions! For absolutist logicians a
> >>logical truth is regarded as 'true in all possible worlds', making
> >>logical laws constant, timeless and universal."

Of course "logical laws are true in all logically possible worlds"
is a (logical) tautology. An "X-possible world" is just a hypothetical
state of affairs that does not contradict X-rules (X is usually
logic or physics).

> >>Where do the laws of logic come from? he asks the absolutist.
> >>Bruno

First you have to ask if they could possibly have been different.
Then you have to ask what notion of possibility you are appealling

> >
> >
> >
> > If you believe in the more primary notion of arithmetical truth (for
> > example if you believe that proposition like "317 is prime" are
> > independent of you) then you can justify classical logic by the Plato
> > Realm (perhaps limited to numbers and their relations), and the many
> > logics will be filtered through the "mind" of the consistent extension
> > of machines.
> > Classical logic is the best tool machines can have to go beyond
> > classical logics.
> > But logic and logics are not fundamental, with comp those emerge from
> > numbers. And nobody knows where numbers come from,
> Cooper says that numbers "come from" the evolutionary advantage of being able 
> to count.  Of course
> that doesn't explain where big numbers come from, or even whether they exist.

Being able to count doesn't remotely mean
numbers exist. It mean certain organisms can calculate, follow rules,

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