Philosophic Magazine, Vol. 31 (1866), p. 521.
[1932]. Nature herself exhibits to us measurable and observable quantities in definite mathematical dependence; the conception of a function is suggested by all the processes of nature where we observe natural phenomena varying according to distance or to time. Nearly all the “known” functions have presented themselves in the attempt to solve geometrical, mechanical, or physical problems.—Merz, J. T.
A History of European Thought in the Nineteenth Century (Edinburgh and London, 1903), p. 696.
[1933]. That flower of modern mathematical thought—the notion of a function.—McCormack, Thomas J.
On the Nature of Scientific Law and Scientific Explanation, Monist, Vol. 10 (1899-1900), p. 555.
Fuchs. Ich bin von alledem so consterniert,
Als würde mir ein Kreis im Kopfe quadriert.
Meph.