He was French.
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Descartes did not invent polynomials.
Philosophically, Descartes was concerned with the existence of reality.
Rene Descartes was a French mathematician who created coordinated geometry.
Rene Descartes was the first to do anything really interesting with them. The Latin form of Descartes is Cartesius and the familiar X-Y coodinates are known as Cartesian coordiates after Descartes.