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- From: mcfarlan@corona.math.washington.edu (Thomas J. McFarlane)
- Subject: Re: Difference between "show" and "prove"
- Message-ID: <1992Dec16.195452.29610@u.washington.edu>
- Keywords: proof demonstration
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington, Mathematics, Seattle
- References: <Bz7KyK.297@ulowell.ulowell.edu> <BzAIMI.Gt@news.cso.uiuc.edu> <1992Dec16.191442.12895@news.Hawaii.Edu>
- Date: Wed, 16 Dec 1992 19:54:52 GMT
- Lines: 27
-
- In article <1992Dec16.191442.12895@news.Hawaii.Edu> lady@uhunix.uhcc.Hawaii.Edu (Lee Lady) writes:
- >
- >Many years ago when I was a computer programmer, one of my fellow workers
- >was complaining about a former professor and said, very emphatically,
- >"He didn't even know the difference between a proof and a demonstration."
- >Not wanting to reveal that I was equally ignorant, I never asked my
- >fellow worker exactly what the distinction was.
- >
- >Later on, after I became a graduate student in mathematics, I did ask
- >several mathematicians and none of them thought there was a difference
- >between the two terms. But obviously somewhere, maybe in mathematical
- >logic, some people have attached different meanings to these two words
- >and I'm still curious about it.
- >
- A distinction between demonstration and proof can be made as follows.
- When one is working within an axiomatic system and derives formal
- consequences of the axioms, this is called a demonstration. It's
- something a computer could verify (in principle). On the other hand,
- when we prove something we appeal to insight. You might say proofs
- are informal, while demonstrations are formal. Of course, one may
- add axioms and definitions to formalize an informal argument, in which
- case the proof becomes a demonstration.
-
- I first learned of this distinction from the logician G. Spencer-Brown
- in his book _Laws of Form_.
-
- Tom McFarlane
-