Henri Poincare Quotes
In the old days when people invented a new function they had something useful in mind.
Citations
Poincaré, Henri. Science and Method. Translated by Francis Maitland, Thomas Nelson and Sons, 1914, p. 43.
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Jules Henri Poincaré was a French mathematician, theoretical physicist, engineer, and philosopher of science. He is often described as a polymath, and in mathematics as "The Last Universalist", since he excelled in all fields of the discipline as it existed during his lifetime.