Mathematician:Jacques Salomon Hadamard

French mathematician who contributed in the fields of:
 * Number Theory
 * Complex Function Theory
 * Differential Geometry
 * Partial Differential Equations

Most famous for proving the Prime Number Theorem in 1896, independently of Charles de la Vallée Poussin.

Nationality
French

History

 * Born: December 8, 1865
 * Died: October 17, 1963

Theorems and Definitions

 * Prime Number Theorem
 * Cartan-Hadamard Theorem (with Élie Joseph Cartan)
 * Cauchy-Hadamard Theorem (with Augustin Louis Cauchy)
 * Hadamard Product
 * Hadamard's Dynamical System
 * Hadamard's Inequality
 * Hadamard Three-Circle Theorem
 * Hadamard Manifold
 * Hadamard Matrix
 * Hadamard Space
 * Ostrowski-Hadamard Gap Theorem (with Alexander Markowich Ostrowski)
 * Hadamard Finite Part Integral
 * Hadamard-Rybczynski Equation (with W. Rybczynski)
 * Hadamard Transform
 * Hadamard's Method of Descent

Books and Papers

 * 1923: Lectures on Cauchy's Problem in Linear Partial Differential Equations
 * 1945: The Psychology of Invention in the Mathematical Field