The CountIdempotents command returns the number of idempotent elements in the magma m.

$\mathrm{with}\left(\mathrm{Magma}\right)\:$

$m≔⟨⟨⟨1\|2\|3⟩\,⟨2\|3\|1⟩\,⟨3\|1\|2⟩⟩⟩$

$m≔\left[\begin{array}{ccc}1& 2& 3\\ 2& 3& 1\\ 3& 1& 2\end{array}\right]$

$\mathrm{CountIdempotents}\left(m\right)$

$1$

The Magma[CountIdempotents] command was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.