If ab=0, either a=0 or b=0
-Products of two non-zero numbers is always non-zero
But products of two non-zero matrices can be zero matrix
Using K given above
K=[1−1;1−1]
That is K(11−1−1)
K2=(K)(K)
=(11−1−1) (11−1−1)
(1×1+−1×11×1+−1×11×−1+−1×−11×−1+−1×−1)
=(0000)
=0 (Null matrix)
Comments