Notes

Determinant is…

Determinant is an array of elements written as a square, and denoted by two vertical lines enclosing the assay. For a 2 x 2 matrix, the determinant is given by the difference between the products of the diagonal terms. For example, the determinant of
$\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]=\mathrm{ad}–\mathrm{bc}$