Question

Give an example of an upper triangular matrix. Use latex

Answer 1

\begin{bmatrix}
    1 & 2 & 3 \\
    0 & 4 & 5 \\
    0 & 0 & 6
\end{bmatrix}

An upper triangular matrix is a matrix where all elements "below" the main diagonal is zero. Alternatively, A matrix \(M\) is an upper triangular matrix if all elements \(m_{i j}\) is zero where \(i<j\).