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- From: weemba@sagi.wistar.upenn.edu (Matthew P Wiener)
- Newsgroups: sci.math
- Subject: It's turtles all the way up and spiders all the way down
- Message-ID: <83977@netnews.upenn.edu>
- Date: 21 Jul 92 15:01:44 GMT
- References: <1992Jul21.132554.152734@ns1.cc.lehigh.edu>
- Sender: news@netnews.upenn.edu
- Reply-To: weemba@sagi.wistar.upenn.edu (Matthew P Wiener)
- Organization: The Wistar Institute of Anatomy and Biology
- Lines: 38
- Nntp-Posting-Host: sagi.wistar.upenn.edu
- In-reply-to: fc03@ns1.cc.lehigh.edu (Frederick W. Chapman)
-
- In article <1992Jul21.132554.152734@ns1.cc.lehigh.edu>, fc03@ns1 (Frederick W. Chapman) writes:
- >If I am not mistaken, there are no *KNOWN* models for ZFC, standard or
- >otherwise! The consistency of ZFC set theory is not known; if a model
- >for ZFC were to exist, then ZFC would be consistent.
-
- Sure it's known. Start with an inaccessible cardinal ...
-
- >I can't speak for anyone else, but I find the notion that the
- >consistency of ZFC has not yet been established to be the most
- >singularly disturbing mathematical news to ever reach my ears,
-
- I think most mathematicians consider it one of the most boring questions in
- the world. If ZFC were proved inconsistent tomorrow, they'd just laugh at
- the set theorists, and get back to doing "real" mathematics. Let someone
- else figure out what they are "really" doing. Relativistic quantum physics
- has existed in a foundational void for half a century.
-
- >given that ZFC is intended to serve as a foundation for the rest of
- >mathematics.
-
- That's leftover propaganda from the beginning of the century. Set theory
- has its own vitality, and like any good branch of mathematics, has things
- to say about other branches. The fact that the other branches often don't
- like what set theory says about them ("Hey wait, what are you doing to my
- conjecture? Stop that!") is not the same as being foundational.
-
- Martin Davis tells a wonderful parable to begin his BAMS review of Donald
- Monk MATHEMATICAL LOGIC. There was a castle far away in the forests, and
- in the deep basements and subbasements, there were thousands of thousands
- of spiders, with ancient webs that had been there for unknown eons. One
- day, a humungous flood swept through the castle. When it had passed, the
- surviving spiders furiously respun their webs as fast as they could. For
- you see, they thought their webs were holding the castle up.
-
- Cf Conway's Mathematical Liberation Movement, in his ONAG.
- --
- -Matthew P Wiener (weemba@sagi.wistar.upenn.edu)
-
-