Determinants

Determinants are defined only for square matrices.  A matrix is an array of elements arranged in m rows and n columns.  When the number of rows equals the number of columns (m=n),  the array is called a square matrix.  We will only trouble ourselves with the determinants of 2x2 and 3x3 matrices.  The notation for the determinant of A is d(A) or |A| and is represented here:


A.6