I have a question on matrix norms and orthogonal transformations. The 2-norm in invariant under orthogonal transformation, for if Q^T*Q=I. But i have trouble showing that for orthogonal Q and Q^H with appropriate dimensions(adsbygoogle = window.adsbygoogle || []).push({});

|| Q^H*A*Q ||2 =|| A ||2

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# Orthogonal transformation of matrix

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