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| − | which is named after him as a particular case of his [https://en.wikipedia.org/wiki/Hadamard_matrix Hadamard matrices] (matrices of $\ | + | which is named after him as a particular case of his [https://en.wikipedia.org/wiki/Hadamard_matrix Hadamard matrices] (matrices of $\pm1$ entries with perpendicular vectors). |
Latest revision as of 13:19, 3 January 2024
Jacques Hadamard
Jacques Hadamard was a great French Mathematician. He was a great-uncle of Laurent Schwartz, who reports numerous fantastic anecdotes about him in his biography. This one, of Hadamard looking for a job as a refugee from Nazi Europe, is my
that is, Fabrice's. favourite:
He is famous in Quantum Information Processing for the Hadamard Gate $$\begin{equation} H= {1\over{\sqrt{2}}} \begin{pmatrix} 1 & 1\\ 1 & -1 \end{pmatrix}\,. \end{equation} $$ which is named after him as a particular case of his Hadamard matrices (matrices of $\pm1$ entries with perpendicular vectors).