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- From: sasghm@theseus.unx.sas.com (Gary Merrill)
- Newsgroups: sci.logic
- Subject: Re: The Mathematical Universe
- Keywords: inconsistent multiplicities
- Message-ID: <Bvr8tF.D99@unx.sas.com>
- Date: 7 Oct 92 14:12:50 GMT
- References: <BvnGy0.BH0@unx.sas.com> <1992Oct5.215056.17908@guinness.idbsu.edu> <BvpECx.41I@unx.sas.com> <1992Oct6.155930.2363@guinness.idbsu.edu>
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- Organization: SAS Institute Inc.
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- Originator: sasghm@theseus.unx.sas.com
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- In article <1992Oct6.155930.2363@guinness.idbsu.edu>, holmes@opal.idbsu.edu (Randall Holmes) writes:
-
- |> Where I do find talk of possible worlds reasonable is in the
- |> discussion of the physical world that we live in. Since I think that
- |> the physical world is a subset of the logical universe, I find it
- |> reasonable to suppose that alternate physical worlds (all possible
- |> ones) _actually exist_ (in exactly the same sense that ours does).
-
- It's this "same sense" that bothers me a bit.
-
- Can I get to another one of them? How? Or am *I* already in (some of)
- them? Is it really *me*? Can we communicate with the populations of
- these possible worlds (as we can with the populations of our own)?
-
- |> Such worlds provide an actual model for Kripke's semantics for modal
- |> logic, for discussions restricted to the physical world; in the
- |> internal language of this model, they are "possible worlds". It is
- |> probably an abuse of terminology to call them "possible worlds"
- |> without reference to this model. I don't think that one of them is
- |> especially worthy of notice, except for the fact that I (and all of
- |> _us_) are in it.
-
- But isn't this a big "except"? As in "The difference between P and -P
- is not worthy of notice except for the fact that P is true and -P is
- false"?
-
- |> In an absolute sense (relative to the _logical_ universe) I am _not_ a
- |> possible worlds realist; I think that there is one actual logical
- |> universe. However, there are various ways to describe the actual
-
- I think the word "actual" is then a no-op here. What is its sense?
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- --
- Gary H. Merrill [Principal Systems Developer, C Compiler Development]
- SAS Institute Inc. / SAS Campus Dr. / Cary, NC 27513 / (919) 677-8000
- sasghm@theseus.unx.sas.com ... !mcnc!sas!sasghm
-