Lennart Nilsson wrote:
> No, you have the burden of showing what possible worlds could possibly mean
> outside a real biological setting.

I have shown that; HYPOTHETICAL states-of-affairs which do not
any laws KNOWN TO US.

> Cooper shows that logical laws are dependent on which population model they
> refer to.

I have no doubt that whatver rules can be reverse-engineered from
practical problem-solving tend to vary.

I doubt that de facto problem-solving defines or constitutes logic.

There are psychological tests which show that most people,
80%-90% , get certain logical problems worng. Of course
the notion of "right" and "wrong" logic that is being appealed
to here comes from the textbook, not from the study
of populations. If populations defined logic, the majority couldn't be
wrong (by textbook logic, anyway).

If popular practice defined logic, people wouldn't have to learn logic.

> Of course that goes for the notion of possibility also...

> LN
> -----Ursprungligt meddelande-----
> Från: everything-list@googlegroups.com
> [mailto:[EMAIL PROTECTED] För 1Z
> Skickat: den 8 juli 2006 22:38
> Till: Everything List
> Ämne: Re: Only logic is necessary?
> 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
> to...

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