Two matrices A = `[a_(ij)]` and B = `[b_(ij)]` are said to be equal if
(i) they are of the same order
(ii) each element of A is equal to the corresponding element of B, that is `a_(ij)` = `b_(ij)` for all i and j.
For example, `[(2,3),(0,1)]` and `[(2,3),(0,1)]` are equal matrices but
`[(3,2),(0,1)]` and `[(2,3),(0,1)]` are not equal matrices. Symbolically,
if two matrices A and B are equal, we write A = B.