See also: Picardy (homonymy)

Charles Picardy Emile , born the July 24th 1856 with Paris and dead the December 11th 1941 in Paris, is a Mathématicien French.

Biography

In spite of the death of his father, director of a silk factory, at the time of the head office of Paris in 1870, it can study with the college Napoleon. Receipt second with the contest of the Polytechnic school and first with the National university, it chooses the latter and makes a success of aggregation in 1877. Assistant in Paris then with Toulouse, he becomes lecturer in 1881. This same year, he marries Marie, girl of his professor Charles Hermite. Three of their five children will die during the First World War.

Emile Picard quickly has a name in the circle of the mathematicians, proving a difficult theorem: any nonconstant whole function, holomorphic in the complex plan, takes each value an infinity of time, with more the one exception. This work on the singularities of the holomorphic functions, supplemented later by Gaston Julia, is worth a first nomination to him to become member of the Academy of Science, election deferred in 1889 because of its young age.

In 1885, he becomes professor with the Faculty of Science of Paris, occupying the pulpit of differential calculus following Joseph-Alfred Serret, then that of analysis and algebra. He also exerts with the central École of arts and manufacture, of 1894 with 1937, forming with the Mécanique more than ten thousand engineers.

His/her daughter Louise Picard married the physicist Louis Dunoyer.

Heritage

Work very innovating of Picardy opened the way with new research. It was the first to use the Théorème of the fixed point of Banach in a method of successive approximations of solutions of differential equations or partial derivative equations. One also owes him of work in algebraic Géométrie and of the applied research on the elasticity and the Chaleur. It was also one of the first defenders of the theories of Einstein. Its Traité of analysis constituted a reference a long time, but Picard was also philosophical and historian of sciences.

Honors and distinctions

• President of the international Congress of mathematics
• Grand Cross of the Legion of honor
• perpetual Secretary for mathematical sciences with the Academy of Science elected in 1917
• Prize winner of the gold medal Mittag-Leffler in 1937.
• Member of the French Academy elected in 1924.

Mathematical works

• Treated of analysis (3 vol.), Editions Jacques Gabay, Seals, 1991
• Theory of the algebraic functions of two independent variables (with Georges Simart). Reprinting corrected in a volume of the edition in two volumes of 1897 and 1906, Chelsea Publishing Co., Bronx, N.Y., 1971.
• Lessons on some functional equations with applications to various problems of analysis and mathematical physics , Gauthier-Villars, Paris, 1950
• Lessons on some simple types of partial derivative equations with applications to the mathematical physics , Gauthier-Villars, Paris, 1950

External bonds

• Biographical note of the French Academy
• Biographical note of the Academy of Science

Random links:

Cubism | Er island | Colli Orientali del Friuli Cialla rosso | Hydraulic diagram | Cortico-basal degeneration