Jacques HadamardDecember 8, 1865 - October 17, 1963) was a mathematician best known for his proof of the prime number theorem.
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. The Hadamard gate in quantum computing uses this matrix.
In his book Psychology of Invention in the Mathematical Field, Hadamard uses introspection to describe mathematical thought processes. In sharp opposition to authors who identify language and cognition, he describes his own mathematical thinking as largely wordless, often accompanied by mental images that condense the overall idea of a proof.
One of his students was André Weil.
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2 External link, resources, and references
3 Further reading
Writings of Jacques Hadamard
External link, resources, and references