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- Path: sparky!uunet!gumby!wupost!usc!usc!not-for-mail
- From: bruck@mathj.usc.edu (Ronald Bruck)
- Newsgroups: sci.math
- Subject: Re: Haughty quote
- Date: 11 Dec 1992 14:21:34 -0800
- Organization: University of Southern California, Los Angeles, CA
- Lines: 43
- Distribution: usa
- Message-ID: <1gb49eINN3ra@mathj.usc.edu>
- References: <1992Dec9.183542.4613@sjsumcs.sjsu.edu> <11DEC199212101828@mary.fordham.edu> <101658@netnews.upenn.edu>
- NNTP-Posting-Host: mathj.usc.edu
-
- In article <101658@netnews.upenn.edu> burshtey@eniac.seas.upenn.edu (Alexander Burshteyn) writes:
- >In article <11DEC199212101828@mary.fordham.edu> nissim@mary.fordham.edu (Leonard J. Nissim) writes:
- >>I was told by my high school calculus teacher many years ago that
- >>Leonard Euler said, "A mathematician is someone to whom e^{i*\pi}=-1
- >>is just as obvious as 2+2=4 is to you." But I have not seen this
- >>in print anywhere.
- >
- >That sentence about the integral from -oo to +oo of e^(-x^2), followed by
- >"Liouville was a mathematician." appears, as I vaguely recall, in Spivak's
- >"Calculus on Manifolds" at the end of the problem section in one of the
- >chapters.
- >
- >>Leonard J. Nissim (nissim@mary.fordham.edu)
- >
- >Alex Burshteyn (burshtey@eniac.seas.upenn.edu)
-
- I like Spivak's sense of humor (esp. the "Institute of Haughty Attitudes"
- in his Joy of TeX), but let's get a little closer to source. I'll quote from
- that notedly accurate (8-) historian of mathematics, Eric Temple Bell (Men
- of Mathematics, p. 452):
-
- In passing it may be amusing to recall that Liouville inspired
- William Thompson, Lord Kelvin, the famous Scottish physicist,
- to one of the most satisfying definitions of a mathematician
- that has ever been given. "Do you know what a mathematician is?"
- Kelvin once asked a class. He stepped to the board and wrote
- $$\int_{-\infty}^{+\infty} e^{-x^2}\,dx = \sqrt{\pi}.$$
- Putting his finger on what he had written, he turned to the
- class. "A mathematician is one to whom {\it that\/} is as
- obvious as that twice two makes four is to you. Liouville was
- a mathematician."
-
- But I believe Bell lifted this (almost verbatim!) from "Life of Lord
- Kelvin", by S. P. Thompson. Robert Edouard Moritz, in his "On Mathematics
- and Mathematicians" (Dover) quotes a very similar passage in "Life of
- Lord Kelvin" (London, 1910, p. 1139). (Perhaps biographers were more prolix
- in those days.)
-
- I very much doubt that Euler made a similar statement. This is probably a
- case of faulty memory on the part of the high-school teacher.
-
- --Ron Bruck
- bruck@mtha.usc.edu preferred
-