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Related to Descartes: Descartes rule of signs
Des·cartes(dā-kärt′), René 1596-1650.
French mathematician, philosopher, and scientist who is considered the father of analytic geometry and the founder of modern rationalism. His main works, Meditations on First Philosophy (1641) and Principles of Philosophy (1644), include the famous dictum "I think, therefore I am."
Descartes(ˈdeɪˌkɑːt; French dekart)
(Biography) René (rəne). 1596–1650, French philosopher and mathematician. He provided a mechanistic basis for the philosophical theory of dualism and is regarded as the founder of modern philosophy. He also founded analytical geometry and contributed greatly to the science of optics. His works include Discours de la méthode (1637), Meditationes de Prima Philosophia (1641), and Principia Philosophiae (1644)
René, 1596–1650, French philosopher and mathematician.