Lower Triangular Matrix/Examples/Square Matrix

Example of Lower Triangular Matrix
An lower triangular square matrix of order $n$:


 * $\mathbf L = \begin{bmatrix}

a_{1 1} &           0 &            0 & \cdots &                0 &            0 \\ a_{2 1} &     a_{2 2} &            0 & \cdots &                0 &            0 \\ a_{3 1} &     a_{3 2} &      a_{3 3} & \cdots &                0 &            0 \\ \vdots &      \vdots &       \vdots & \ddots &           \vdots &       \vdots \\ a_{n - 1, 1} & a_{n - 1, 2} & a_{n - 1, 3} & \cdots & a_{n - 1, n - 1} &           0 \\ a_{n 1} &     a_{n 2} &      a_{n 3} & \cdots &     a_{n, n - 1} &      a_{n n} \\ \end{bmatrix}$