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- Newsgroups: sci.math
- Path: sparky!uunet!think.com!enterpoop.mit.edu!galois!riesz!jbaez
- From: jbaez@riesz.mit.edu (John C. Baez)
- Subject: Re: Difference between "show" and "prove"
- Message-ID: <1992Dec20.205553.26951@galois.mit.edu>
- Keywords: proof demonstration
- Sender: news@galois.mit.edu
- Nntp-Posting-Host: riesz
- Organization: MIT Department of Mathematics, Cambridge, MA
- References: <BzAIMI.Gt@news.cso.uiuc.edu> <1992Dec16.191442.12895@news.Hawaii.Edu> <1992Dec16.195452.29610@u.washington.edu>
- Date: Sun, 20 Dec 92 20:55:53 GMT
- Lines: 25
-
- In article <1992Dec16.195452.29610@u.washington.edu> mcfarlan@corona.math.washington.edu (Thomas J. McFarlane) writes:
- >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.
-
- Not usually. In all 3 logic books I happen to have at hand, it's called
- a proof. While one is free to make up whatever distinctions one likes,
- don't expect anyone else to know about them. Spencer-Brown is not
- representative of the practice of mathematicians and logicians, by the
- way, and is often regarded as a flake.
-
-