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- Path: sparky!uunet!olivea!charnel!sifon!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!galois!riesz!jbaez
- From: jbaez@riesz.mit.edu (John C. Baez)
- Newsgroups: sci.physics
- Subject: Re: Lowneheim-Skolem theorem (was: Continuos vs. discrete models)
- Message-ID: <1992Nov23.014417.14551@galois.mit.edu>
- Date: 23 Nov 92 01:44:17 GMT
- References: <1992Nov17.124233.24312@oracorp.com> <1992Nov20.220424.22979@galois.mit.edu> <TORKEL.92Nov21091802@bast.sics.se>
- Sender: news@galois.mit.edu
- Organization: MIT Department of Mathematics, Cambridge, MA
- Lines: 27
- Nntp-Posting-Host: riesz
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- In article <TORKEL.92Nov21091802@bast.sics.se> torkel@sics.se (Torkel Franzen) writes:
- >In article <1992Nov20.220424.22979@galois.mit.edu> jbaez@riesz.mit.edu
- > (John C. Baez) writes:
- >
- > >I object. Lowenheim-Skolem says there are countable models of the
- > >reals; you can go ahead and use these if you like, and I will not
- > >object, since this does not affect what *theorems* you can prove about
- > >the real numbers.
- >
- > I'm pleased to find that the physics of the real numbers is recognized
- >as proper physics these days.
-
- What do you mean by the "physics of the real numbers".
-
- >But what do you mean by a "model of the
- >reals"?
-
- I mean a model of some set of axioms for the reals.
-
- >This doesn't mean anything in standard terminology. Also, what do you mean
- >by "using" a countable model (of whatever unspecified theory you have in
- >mind)?
-
- I didn't mean anything in particular by "using".
- My whole point was that you can go do whatever the heck you please with
- models of an axiom system but that it will not affect what theorems can
- be proved in the axiom system.
-