(source)

JacquesSalomon Hadamard
(8 Dec 1865  17 Oct 1963)
French mathematician.

Science Quotes by JacquesSalomon Hadamard (4 quotes)
~~[Misattributed]~~ The shortest path between two truths in the real domain passes through the complex domain.
In fact, this quote is a paraphrase from Paul Painlevé.
— JacquesSalomon Hadamard
Widely seen incorrectly attributed to Hadamard, and without primary source citation. However, Hadamard did not originate the quote, as shown by his own introductory phrase of, “It has been written that the shortest and best way between two truths of the real domain often passes through the imaginary one,” in
An Essay on the Psychology of Invention in the Mathematical Field (1945), 123. The quote in fact originates from Paul Painlevé,
Notice sur les travaux scientifiques (1900), 2. See the
Paul Painlevé Quotes page on this website.
Good mathematicians when they make errors, which is not infrequently, soon perceive and correct them. As for me (and mine is the case of many mathematicians), I make many more of them than my students do; only I always correct them so that no trace of them remains in the final result.
— JacquesSalomon Hadamard
In An Essay on the Psychology of Invention in the Mathematical Field (1954), 49.
It is important for him who wants to discover not to confine himself to one chapter of science, but to keep in touch with various others.
— JacquesSalomon Hadamard
In An Essay on the Psychology of Invention in the Mathematical Field (1954), 54.
Practical application is found by not looking for it, and one can say that the whole progress of civilization rests on that principle.
— JacquesSalomon Hadamard
In An Essay on the Psychology of Invention in the Mathematical Field (1945), 124.
See also:
 8 Dec  short biography, births, deaths and events on date of Hadamard's birth.
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) 
Carl Sagan
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