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A square matrix $B =[a_{ij}]_{n×n}$ is called a unit matrix if : |
$a_{ij}=\left\{\begin{matrix}1; & i≠j\\0; & i=j\end{matrix}\right.$ $a_{ij}=\left\{\begin{matrix}1; & i=j\\0; & i≠j\end{matrix}\right.$ $a_{ij}=\left\{\begin{matrix}-1; & i≠j\\0; & i=j\end{matrix}\right.$ $a_{ij}=\left\{\begin{matrix}1; & i=j\\-1; & i≠j\end{matrix}\right.$ |
$a_{ij}=\left\{\begin{matrix}1; & i=j\\0; & i≠j\end{matrix}\right.$ |
