Rene descartes (1596 March 31-1650 February 1 1) is a famous French philosopher, scientist and mathematician. He was born in Andel-Loire, France, and made great contributions to the development of modern mathematics. Because he formulated the geometric coordinate system, he is known as the father of analytic geometry. He was also the founder of modern western philosophy and the pioneer of modern materialism, and put forward the idea of "universal doubt". His philosophical thoughts deeply influenced later Europeans and opened up the so-called "European rationalism" philosophy. Descartes came to Stockholm on 1649 at the invitation of Christina in queen christina, but unfortunately he got pneumonia in this "land of bears, snow and rocks" and died on 1650 in February.

Contribution:

In mathematics:

Descartes' most important contribution to mathematics is the creation of analytic geometry. Descartes succeeded in connecting algebra and geometry which were completely separated at that time. In his book; Descartes proved to the world that geometric problems can be reduced to algebraic problems, and geometric properties can also be discovered and proved through algebraic transformation. Descartes introduced the concepts of coordinate system and line segment operation. Descartes' achievements in mathematics provide a solid foundation for future generations to engage in calculus, which is an important cornerstone of modern mathematics. In addition, many mathematical symbols used now are first used by Descartes, including known numbers A, B, C, unknowns X, Y, Z and so on. And the representation of the index. He also discovered the relationship between the edges, vertices and surfaces of convex polyhedron, which was later called Euler-Descartes formula. He also discovered the Cartesian branch line, which is common in calculus.

Physical aspects:

In physics, Descartes also made some achievements. He is in: the theory of refraction law of light was demonstrated for the first time. He also explained the causes of people's visual impairment and designed a kind of lens to correct their vision. In mechanics, Descartes developed Galileo's theory of motion relativity, emphasizing the linearity of inertial motion. Descartes discovered the principle of conservation of momentum. He also developed some theories, such as universe evolution theory and vortex theory. Although there are many defects in the specific theory, it still has an impact on future natural scientists.

He also used the refraction law of light to explain the rainbow phenomenon, and analyzed the color through the rotation speed of elemental particles.