# Unit Matrix

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Definition
 Unit Matrix A square matrix $A$ of order n $A=(a_{i,j})$ is said to be a unit matrix if  $a_{i,j}=1$ if $i= j$ $a_{i,j}=0$ if $i\ne j$ 

## Examples

      $\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$
$\begin{pmatrix} 1 & 0 & 0\\ 0 & 1 & 0\\ 0 & 0 & 1 \end{pmatrix}$


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