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Jacques Hadamard

Jacques Solomon Hadamard (December 8, 1865 - October 17, 1963 ) was one of the mathematicians who proved the prime number theorem.

He studied at the �cole Normale Sup�rieure.

After the Dreyfus affair, which involved him personally, he became politically active and became a staunch supporter of Jewish causes.

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.


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