# An Introduction to René Descartes

René Descartes was a French philosopher, scientist, and mathematician of the 17th century. During his lifetime, he participated in a variety of fields, notably optics, geometry, and astronomy. He was the first to publish a text on the laws of refraction, or what governs the bending of light as it passes from one medium to another. He invented analytic geometry, which uses a coordinate system to represent geometric figures with…