René Descartes
Born in France in 1596, René Descartes, mathematician, scientist, and philosopher, is among the most acclaimed
scholars in history.
Descartes and Philosophy
Descartes has sometimes been referred to as the father of modern philosophy, and is perhaps best known for expressing
the axiom "Cogito, ergo sum," or "I think, therefore I am." In 1637, he published his most famous philosophical work,
Discours de la Méthode (Discourse on Method). In this work, he describes some rules for the pursuit of
knowledge:
 accept something as true only if you believe it to be so
 solve problems systematically by analyzing them piece by piece
 consider the simple things first, then the more complex ones
 review your work to make sure you haven't left anything out
Descartes and Mathematics
Descartes published La Géométrie in 1637, as part of Discours de la Méthode. In
La Géométrie, Descartes first showed how to use a coordinate system to visually represent algebraic
equations. In doing so, he closely linked geometry and algebra, and paved the way for future innovations in two and
threedimensional visual representations.
The coordinate system is the basis of all visual representations that are computerdrawn and represented as pixels.
Pixels are the smallest imageforming unit of a video display. For example, if a computer's video display has a resolution
of 1024 by 768, this is another way of saying that it represents images on the video display using a type of coordinate
plane that measures 1024 units by 768 units.
The coordinate system has also been adapted to three dimensions for use in important innovations. Some of these include
CT scanning, a medically useful method of taking threedimensional pictures of internal organs, and the Global Positioning
System (GPS), which uses satellites and computers to pinpoint the location of an object on Earth.
