More quotes by Joseph Louis Lagrange
Newton was the greatest genius that ever existed, and the most fortunate, for we cannot find more than once a system of the world to establish.
As long as algebra and geometry proceeded along separate paths, their advance was slow and their applications limited. But when these sciences joined company, they drew from each other fresh vitality and thenceforward marched on at a rapid pace toward perfection.
Dans Les Leçons Élémentaires sur les Mathématiques (1795)
That method [of infinitesimals] has the great inconvenience of considering quantities in the state in which they cease, so to speak, to be quantities; for though we can always well conceive the ratio of two quantities, as long as they remain finite, that ratio offers the to mind no clear and precise idea, as soon as its terms become, the one and the other, nothing at the same time.
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