Cartesian dualism

Descartes' philosophy, Cartesian dualism, is based around the creation of two different realities in the universe. These two different realities are thinking substance and extended substance. Thinking substance is everything inside the mind, while extended substance is everything outside the mind. Descartes recognized the importance of mathematics in the world around him. To him, everything in the physical half of the universe (extended substance) could be interpreted through formulas and equations. This philosophy is an example of the biggest difference between Bacon and Descartes, which is Descartes' use of mathematics.