Henri Poincare Quotes
Thus, they are free to replace some objects by others so long as the relations remain unchanged.
Citations
Poincaré, Henri. Science and Hypothesis. Walter Scott Publishing Co., 1905, p. 20.
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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.