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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>Prove that the Fourier matrices <math>F_2,F_3</math>, which are given by <math display="block"> F_2=\begin{pmatrix}1&1\\ 1&-1\end{pmatrix}\quad,\quad F_3=\begin{pmatrix}1&1&1\\ 1&w&w^2\\ 1&w^2&w\end{pmatrix} </math> with <math>w=e^{2\pi i/3}</math> are the only Hadamard matrices at <math>N=2,3</math>, up to equivalence.") | Apr 20'25 at 1:30 | +391 |