4  Minors and Cofactors
In this section, we will learn to write the expansion of a determinant in compact form
using minors and cofactors Definition 1 Minor of an element aij of a determinant is the determinant obtained by
deleting its ith row and jth column in which element aij lies Minor of an element aij is
denoted by Mij Remark Minor of an element of a determinant of order n(n ≥ 2) is a determinant of
order n – 1