IsIdempotent - Maple Help

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Magma

 IsIdempotent
 test whether a given magma is idempotent

 Calling Sequence IsIdempotent( m )

Parameters

 m - Array representing the Cayley table of a finite magma

Description

 • The IsIdempotent command returns true if the given magma is idempotent, that is, if it satisfies the law X*X = X.  It returns false otherwise.

Examples

 > $\mathrm{with}\left(\mathrm{Magma}\right):$
 > $m≔⟨⟨⟨1|1|2⟩,⟨2|2|3⟩,⟨1|2|3⟩⟩⟩$
 ${m}{≔}\left[\begin{array}{ccc}{1}& {1}& {2}\\ {2}& {2}& {3}\\ {1}& {2}& {3}\end{array}\right]$ (1)
 > $\mathrm{IsIdempotent}\left(m\right)$
 ${\mathrm{true}}$ (2)
 > $m≔⟨⟨⟨1|2|3⟩,⟨2|3|3⟩,⟨3|1|2⟩⟩⟩$
 ${m}{≔}\left[\begin{array}{ccc}{1}& {2}& {3}\\ {2}& {3}& {3}\\ {3}& {1}& {2}\end{array}\right]$ (3)
 > $\mathrm{IsIdempotent}\left(m\right)$
 ${\mathrm{false}}$ (4)

Compatibility

 • The Magma[IsIdempotent] command was introduced in Maple 15.