Question

What is the identity matrix?

Answer 1

Hi.

Here is your answer------

Identity Matrix--- A diagonal matrix in which each element of its leading diagonal is unity (i.e., 1) is called a unit or identity matrix. It is denoted by I.
In other words, it is a square matrix in which each element of its leading diagonal is equal to 1 and all other elements of its leading diagonal is equal to 1 and all other remaining elements of the matrix are zero each.

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The attached image will show the Identity Matrix