Identity matrix
Multiplying a scalar number by 1 will result in the original scalar number. There is a matrix analogue to this, the identity matrix. The identity matrix is commonly written as I. If a matrix is multiplied by the identity matrix, the result is the original matrix 
.
In the identity matrix, all non-diagonal elements are 0, while all diagonal elements are one 
. The identity matrix looks like this:
Getting ready
Because the identity matrix has ...
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