"An ancient writer said that arithmetic and geometry are the wings of mathematics; I believe one can say without speaking metaphorically that these two sciences are the foundation and essence of all the sciences which deal with quantity. Not only are they the foundation, they are also, as it were, the capstones; for, whenever a result has been arrived at, in order to use that result, it is necessary to translate it into numbers or into lines; to translate it into numbers requires the aid of arithmetic, to translate it into lines necessitates the use of geometry."
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Sources
Joseph Louis Lagrange. Leçons Elémentaires sur les Mathématiques, Leçon seconde. p. 262. Reported in Moritz (1914).
https://en.wikiquote.org/wiki/Arithmetic
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Arithmetic
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