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- Newsgroups: sci.logic
- Path: sparky!uunet!think.com!linus!linus.mitre.org!linus!guttman
- From: guttman@circe.mitre.org (Joshua D. Guttman)
- Subject: Re: Why Logic?
- In-Reply-To: cotera@woods.ulowell.edu's message of Mon, 16 Nov 1992 14:16:53 GMT
- Message-ID: <GUTTMAN.92Nov19120734@circe.mitre.org>
- Sender: news@linus.mitre.org (News Service)
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- Organization: The MITRE Corporation, Bedford, MA 01730
- References: <1992Nov16.091653.1@woods.ulowell.edu>
- Distribution: world
- Date: Thu, 19 Nov 1992 17:07:34 GMT
- Lines: 22
-
- In article <1992Nov16.091653.1@woods.ulowell.edu> cotera@woods.ulowell.edu writes:
-
- Can anyone explain why we use logic? Unfortunately, any logical arguments to
- support logic, are unfortunately, invalid.
- --Ray Cote
-
- On the contrary, logical arguments may be not only valid, but also informative.
-
- For instance, to explain why we use classical first order logic (for many
- important purposes), logical theorems such as soundness and completeness are
- very relevant. So are fancier theorems such as the non-enumerability of
- consequence in 2nd order logic, or Lindstrom's theorem.
-
- Of course it depends what the argument is intended to accomplish. A truly
- illogical person (perhaps a child) must be trained, not convinced. A logical
- person who wants to gain insight into what he's doing and why can learn a lot
- from mathematical logic.
-
- I believe that this point is originally due to Michael Dummett, "Justification
- of Deduction", in _Truth_and_Other_Enigmas_.
-
- Josh
-