What is the official notation (and the source of the notation) of the following permutations matrices (one shift left of identity matrix):
For $n=2$
$P = \left(\begin{matrix}0 & 1\\ 1&0\end{matrix}\right)$
For $n=3$
$P = \left(\begin{matrix}0 & 0 & 1\\ 1 & 0 & 0 \\ 0 & 1 & 0\end{matrix}\right)$