Matrix (mathematics) - Square Matrices - Main Types

Main Types

Name Example with n = 3
Diagonal matrix \begin{bmatrix} a_{11} & 0 & 0 \\ 0 & a_{22} & 0 \\ 0 & 0 & a_{33} \\ \end{bmatrix}
Lower triangular matrix \begin{bmatrix} a_{11} & 0 & 0 \\ a_{21} & a_{22} & 0 \\ a_{31} & a_{32} & a_{33} \\ \end{bmatrix}
Upper triangular matrix \begin{bmatrix} a_{11} & a_{12} & a_{13} \\ 0 & a_{22} & a_{23} \\ 0 & 0 & a_{33} \\ \end{bmatrix}

Read more about this topic:  Matrix (mathematics), Square Matrices

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