Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist
As quoted in World Unity, Vol. IX, 3rd edition (1931), p. 190
1930s
"The Mathematician", in The Works of the Mind (1947) edited by R. B. Heywood, University of Chicago Press, Chicago
Context: I think that it is a relatively good approximation to truth — which is much too complicated to allow anything but approximations — that mathematical ideas originate in empirics. But, once they are conceived, the subject begins to live a peculiar life of its own and is … governed by almost entirely aesthetical motivations. In other words, at a great distance from its empirical source, or after much "abstract" inbreeding, a mathematical subject is in danger of degeneration. Whenever this stage is reached the only remedy seems to me to be the rejuvenating return to the source: the reinjection of more or less directly empirical ideas.
Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist
As quoted in World Unity, Vol. IX, 3rd edition (1931), p. 190
1930s
“Each vulgar opinion, proved to be erroneous, is an approximation to truth.”
Georg Forster book A Voyage Round the World
Book I, ch. II, The Passage from Madeira to the Cape Verd Islands, and from thence to the Cape of Good Hope.
A Voyage Round the World (1777)
Richard Feynman (1918–1988) American theoretical physicist
volume I; lecture 1, "Atoms in Motion"; section 1-2, "Matter is made of atoms"; p. 1-3
The Feynman Lectures on Physics (1964)
“Force is not a fact at all, but an idea embodying what is approximately the fact.”
William Kingdon Clifford (1845–1879) English mathematician and philosopher
Preface footnote, p. ix. Mr. R. Tucker searched Clifford's note books for Karl Pearson and sent him the above quote, in Clifford's handwriting.
The Common Sense of the Exact Sciences (1885)
“Good approximations often lead to better ones.”
George Pólya (1887–1985) Hungarian mathematician
Mathematical Methods in Science (1977)
Donald A. Norman book The Design of Everyday Things
Source: The Design of Everyday Things (1988, 2002), Ch. 5, p. 131.
Harold Chestnut (1917–2001) American engineer
Source: Systems Engineering Tools, (1965), p. 108
Richard Feynman book The Pleasure of Finding Things Out
I might think about it a little bit, and if I can't figure it out then I go on to something else. But I don't have to know an answer. I don't feel frightened by not knowing things, by being lost in the mysterious universe without having any purpose — which is the way it really is, as far as I can tell. Possibly. It doesn't frighten me. <br class="br">Source: No Ordinary Genius (1994), p. 239, from interview in "The Pleasure of Finding Things Out" (1981): video http://www.youtube.com/watch?v=NEwUwWh5Xs4&t=48m10s
William Poundstone (1955) American writer
Part Six, Blowing Up, Survival Motive, p. 296-297
Fortune's Formula (2005)