Bruno Marchal skrev:
Le 05-juil.-07, à 14:19, Torgny Tholerus wrote:
David Nyman skrev:
You have however drawn our attention to something very interesting and
important IMO.  This concerns the necessary entailment of 'existence'.
1.  The relation 1+1=2 is always true.  It is true in all universes.
Even if a universe does not contain any humans or any observers.  The
truth of 1+1=2 is independent of all observers.

I agree with you (despite a notion as "universe" is not primitive in my 
opinion, unless you mean it a bit like the logician's notion of model 
perhaps). As David said, this is arithmetical realism.

Yes, you can see a universe as the same thing as a model.

When you have a (finite) set of rules, you will always get a universe from that set of rules, by just applying those rules an unlimited number of times.  And the result of these rules is existing, in the same way as our universe is existing.

Our universe is the result of some set of rules.  The interesting thing is to discover the specific rules that span our universe.

Torgny Tholerus

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