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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>Prove that the only complex Hadamard matrices at <math>N=4</math> are, up to the standard equivalence relation, the matrices <math display="block"> F_4^q=\begin{pmatrix} 1&1&1&1\\ 1&-1&1&-1\\ 1&q&-1&-q\\ 1&-q&-1&q \end{pmatrix} </math> with <math>q\in\mathbb T</math>, which appear as Di\c t\u a deformations of <math>W_4=F_2\otimes F_2</math>.") | Apr 20'25 at 1:30 | +416 |