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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>If <math>H\in M_M(\mathbb T)</math> and <math>K\in M_N(\mathbb T)</math> are complex Hadamard matrices, prove that so is the matrix <math display="block"> H\otimes_QK\in M_{MN}(\mathbb T) </math> given by the following formula, with <math>Q\in M_{M\times N}(\mathbb T)</math>, <math display="block"> (H\otimes_QK)_{ia,jb}=Q_{ib}H_{ij}K_{ab} </math> called Di\c t\u a deformation of <math>H\otimes K</ma...") | Apr 20'25 at 1:30 | +509 |