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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>Prove that for the usual matrices <math>A,B\in M_N(\mathbb C)</math> we have <math display="block"> \sigma^+(AB)=\sigma^+(BA) </math> where <math>\sigma^+</math> denotes the set of eigenvalues, taken with multiplicities.") | Apr 20'25 at 1:31 | +290 |