chapter  25
The theory of matrices and determinants
Pages 10

A × C = (−6.4 26.1

22.7 −56.9 )

C × A = (−33.5 −53.1

23.1 −29.8 )

Hence they are not equal

⎥ ⎥ ⎥ ⎥ ⎦

A unit matrix, I, is one in which all elements of the leading diagonal (\) have a value of 1 and all other elements have a value of 0. Multiplication of a matrix by I is the equivalent of multiplying by 1 in arithmetic.