1865 – Born on the 8th of December.
– Hadamard studied at the École Normale Supérieure under the direction of Charles Émile Picard.
– He introduced the idea of well-posed problem in the theory of partial differential equations.
– He also gave his name to the Hadamard inequality on volumes, and the Hadamard matrix, on which the Hadamard transform is based.
– His students included Maurice Fréchet, Paul Lévy, Szolem Mandelbrojt and André Weil.
1896 – His proof of the prime number theorem.
1963 – Died on the 17th of October.