home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.logic
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!zuni!dabrowsa
- From: dabrowsa@zuni.ucs.indiana.edu (Andrew Dabrowski)
- Subject: Re: ZFC+~Con(ZFC)
- Message-ID: <Bt1xnE.9Mr@usenet.ucs.indiana.edu>
- Summary: Nonstandard arithmetic
- Sender: news@usenet.ucs.indiana.edu (USENET News System)
- Nntp-Posting-Host: zuni.ucs.indiana.edu
- Organization: UCS, Indiana University, Bloomington, IN
- References: <1992Aug16.000726.5227@galois.mit.edu>
- Date: Sun, 16 Aug 1992 01:04:25 GMT
- Lines: 10
-
- If a model satisfies ~Con(ZFC) then it must actually contain some object
- which it thinks is a natural number coding a proof of 1=0, say. This
- object cannot be a standard natural number, or it would mean ZFC really is
- inconsistent, so it must be a nonstandard number. Hence such a structure
- models nonstandard arithmetic. I don't know of any systematic treatment
- of models obtained this way, though.
-
- Andrew Dabrowski Try again. Fail again. Fail better.
- dabrowsa@ucs.indiana.edu -Worstward Ho
- Indiana U/Bloomington Samuel Beckett
-