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posted by Anonymous
posted 98d 22h ago
Siano $a,b$ reali positivi.
\begin{pmatrix} a & 0 \\ 0 & b \end{pmatrix}

ha autovalori $a$ e $b$, mentre
\begin{pmatrix} 0 & a \\ b & 0 \end{pmatrix}

ha autovalori $\pm \sqrt{ab}$.
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