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DESCARTES Rule in math class. (geometry and up!)
Short answer: Descartes' doubt was like WWI - the doubt to end all doubt. Only by doubting everything could Descartes hope to find anything that was certain (even if the only certainty is that nothing else is certain!).
It was the French mathematician Rene Descartes.
he was a great leader and he was an amazing at math and science
Descartes is best remembered for what is known as the Cartesian Coordinate System, which is the familiar graph having an x axis and a perpendicular y axis.