titles There are many questions with matrices in the title, although by a quick search I mostly found $2\times2$. is $3\times3$ too big? Should titles like this be edited? Testing the diagonalizability of matrix $B= \left(\begin{array}(\lambda_1 & a & b \\ 0 & \lambda_1 & c\\ 0 & 0 & \lambda_2\end{array}\right)$.

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