Let Q^H * A * Q = T = D + N be Schur decomposition of A. D is a diagonal matrix with eigenvalues of A and N is strictly upper triangular matrix. This sentence is used in a proof which im not going to state but at some point it states that ||A^k|| 2 norm = ||T^k|| 2 norm for k>=0. I dont understand(adsbygoogle = window.adsbygoogle || []).push({});

where this equality comes from. I tried to work this equality out with an example of taking

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# Algebra problem

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