Original Description:
Rene Descartes is a famous French philosopher, physicst and mathematician in the seventeenth century.
He is "The Father of Analytical Geometry". His major contribution to analytical geometry was his realization that a point in a plane could be completely determined if its distances, x and y coordinates, are given from two fixed lines that make right angles in the plane given (the Cartesian plane). Also, a given equation f(x, y) can satisfy an infinite number of x values with their corresponding y values on a given curve. His idea of coordinate system ties together the two great brankches of mathematics, albegra and geometry.
His famous word is, "I think, therefore I am."