Ononot — Let A be a 2 \times 2 matrix with eigenvalues 1, 2 and B be

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Eigenvalues & Eigenvectorsmedium

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Let $A$ be a $2 \times 2$ matrix with eigenvalues $1, 2$ and $B$ be a $2 \times 2$ matrix with eigenvalues $3, 4$ . What are the eigenvalues of the Kronecker sum $A \oplus B = A \otimes I_2 + I_2 \otimes B$ ?