Like the Rosicrucians, he lived alone and in seclusion, changed his residence often during his 22 years in the Netherlands, he lived in 18 different placespracticed medicine without charge, attempted to increase human longevity, and took an optimistic view of the capacity of science to improve the human condition.
Analytic Geometry Analytic geometry is used to find distances, slopes, midpoints, and many many other things using special equations and formulas to determine what a person is looking for.
There are many simple formulas to analytic geometry, but some of them get very complex and difficult. Therefore, while Cartesian dualism paved the way for modern physicsit also held the door open for religious beliefs about the immortality of the soul.
Analytic geometry is broken up into two sections, finding an equation to match points and finding points to match equations. He perceives his body through the use of the senses; however, these have previously been unreliable.
His theories on reflexes also served as the foundation for advanced physiological theories more than years after his death.
While within, he had three dreams  and believed that a divine spirit revealed to him a new philosophy.
Descartes was thought to have been fairly ill throughout his childhood. Analytic geometry is a, branch of geometry in which points are represented with respect to a coordinate system, such as Cartesian coordinates, and in which the approach to geometric problems is primarily algebraic.