Question

What is the strictly triangular matrix?

Answer 1

Strictly triangular matrix:

If all the elements of the main diagonal of a square matrix are zero, then the matrix is called a strictly triangular matrix.

Example:

$A=\left[\begin{array}{ccc}0& 3& 2\\ 4& 0& 1\\ 1& 2& 0\end{array}\right]$