Descartes, Rene   French mathematician and philosopher born in Indre-et-Loire, France (1596-1650). Descartes invented analytical geometry and developed what is now called the Cartesian coordinate system, which describes geometry in term of algebra. He was an influential philosopher as well, famously stating, “Cogito ergo sum” (I think therefore I am). For further information see Rene Descartes.

Used in the following modules: Light I, Wave Mathematics