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- Newsgroups: sci.math
- Path: sparky!uunet!destroyer!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!regeorge
- From: regeorge@magnus.acs.ohio-state.edu (Robert E George)
- Subject: Re: Proof of God's Existence
- Message-ID: <1992Sep3.162314.26632@magnus.acs.ohio-state.edu>
- Sender: news@magnus.acs.ohio-state.edu
- Nntp-Posting-Host: bottom.magnus.acs.ohio-state.edu
- Organization: The Ohio State University
- References: <1992Sep1.215331.89956@vaxc.cc.monash.edu.au> <1992Sep1.224045.8620
- Date: Thu, 3 Sep 1992 16:23:14 GMT
- Lines: 38
-
- In article <1992Sep1.224045.8620@vax.oxford.ac.uk> loader@vax.oxford.ac.uk writ
- es:
- >In article <1992Sep1.215331.89956@vaxc.cc.monash.edu.au>, kevin@vaxc.cc.monash
- .edu.au writes:
- [deletions]
- >> 1. It is possible to imagine a world, completely agreeing with the current o
- ne
- >> on all sensory data, in which God exists.
- >> 2. It is possible to imagine a world, completely agreeing with the current o
- ne
- >> on all sensory data, in which God doesn't exists.
- >> Call a world satisfying condition 1 M, and a world satisfying 2 M'.
- >> Then the existence of these epistemically indistinguishable worlds proves th
- at
- >> any ontological statement about God is INDEPENDENT of any epistemically
- >
- >It is possible to imagine a world completely agreeing with the current
- >one on all sensory data, in which Fermat's last theorem is false.
- >It is possible to imagine a world completely agreeing with the current
- >one on all sensory data, in which Fermat's last theorem is true.
- >Then by the fact that mathematical truths are necessary truths and true
- >in all possible worlds, FLT is true and false.
- >
- >Kabloom
- >(The world disappears in a puff of logic.)
- [deletions]
- I think there is a need to use "imagine" very carefully. "Imagine" in the
- original posting seems to mean more than a pipe-dream sort of fantasy.
- The independence of the Parallel Postulate from the other axioms is shown
- by defining ("imagining" if you like, but in *very concrete terms*) systems
- for which the axioms of so-called neutral geometry and the PP hold; and by
- defining a syustem for which the NG axioms hold and the PP does not.
- Endulging in nebulous speculation ("Say, buddy, suppose the Parallel Postulate
- doesn't hold out in the next galaxy") doesn't count as imagining in this
- context.
-
- Robert George
- (speaking only for myself)
-