# Who is Jules Henri Poincare?

June 25, 2021Born April 29, 1854 in Nans, died July 17, 1912 in Paris. French mathematician and physicist.

He was a professor at the Sorbonne University until his death in 1912. Poincaré has given brilliant lectures on a wide variety of subjects each year; These include mathematical physics subjects such as potential theory, light, electricity, conduction of heat, electromagnetism, hydrodynamics, celestial mechanics, thermodynamics, and mathematical subjects such as probability theory.

In addition to the lectures he gave, Poincaré was also influential with the many works he wrote. His books on philosophy of science such as “The Value of Science” and “Science and Assumption”, which have also been translated into Turkish, are just a few of them. He also published articles on automorphic and Fuchs functions, differential equations, topology and fundamentals of mathematics, and found a general method for solving differential equations. Regarding the fundamentals of mathematics, he thought that the real tool of mathematical thinking was mathematical induction, and he did not think that this method could be reduced to a simpler method intuitively.

Newton introduced many problems to mathematical astronomy. Euler, Lagrange and Laplace have made great strides in this area. These mathematicians were seen as inaccessible giants. When Cauchy developed the theory of complex functions, Poincaré was left with a stockpile of weapons. It was with these powerful weapons that celestial mechanics found a giant mathematician like Poincaré. Thus, mathematical astronomy found its final form with Poincaré. He achieved his greatest success in this field in 1889 with the three-body problem. King of Sweden II. Oscar presented the n-body problem to the competition. Poincaré could not solve this n-body problem. However, the jury, including Weierstrass, Hermite, and Mittag-Leffler, awarded Poincaré for his general discussion of differential equations in dynamics and his essay on the three-body problem. Poincaré received the prize of 2,500 crowns, and France gave him a high French rank, so as not to be inferior to the King of Sweden.

Poincaré was also interested in celestial mechanics, especially on the Three-Body Problem. He studied divergent series related to this field, developed the Theory of Asymptote Expansions, dealt with issues such as the regularity of orbits and the shapes of celestial bodies. The same issues are also of interest to Laplace; but Poincaré is unique in every way. Modern theories of relativity, cosmogony, probability, and topology have all been heavily influenced by Poincaré’s research.