Structural aspects of semigroups based on digraphs

Given any digraph $D$ without loops or multiple arcs, there is a natural construction of a semigroup $\langle D\rangle$ of transformations. To every arc $(a,b)$ of $D$ is associated the idempotent transformation $(a\to b)$ mapping $a$ to $b$ and fixing all vertices other than $a$... (read more)

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