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

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Cooper shows that logical laws are dependent on which population model they
refer to. Of course that goes for the notion of possibility also...
LN
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Skickat: den 8 juli 2006 22:38
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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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